How I love RUclips for this very reason! Just doing some DIY projects and this helped tremendously. I’d like to vote for the second example lol seems easiest with less work and fastest. Great video 👍👍👍👍
These demonstrations are excellent! You made them so easy to follow and understand. Thanks for your effort and for sharing them. I really appreciate it.
Thanks for explaining and showing this with the paper or saying anything with a 90 degree angle. It sounds simple, but it seems like we forget all about angles of items and such when we need to remember. You explain things well and that means a lot coming from a special ed teacher.
The 3rd method is the quickest and easiest, it's the one I always use. I'm not trying to impress anyone with needless geometry skills. Great infom on all 3.
here's a very simple solution: draw a straight line between any two points on the circle, find the line's center point and draw a line (again, from edge to edge) through that midpoint that is perpendicular to the original line. The new line is a diameter and its midpoint is the center of the circle.
I'm in the middle of a project, and this is a problem I'm facing soon. The 3 solutions you shared make sense, and doing this no longer seems so daunting. Thanks for your help.
I was taught to use a compass set at the radius and draw two arcs in the centre and where they cross you’ll find the centre. Something like that, it’s been over 50 years since I was taught this in geometry class.
I measure from a outside point of the circle and find the largest measurement to find the diameter. Mark it then repeat in a different spot. Where they intersect is the center. You can do three to check your center.
Pop through time-space into space-time, realize you are the circle, you are the center. Come back, share what you learned, get crucified. Take a nap, etc. Great video, very helpful and I love that you tried all the suggestions from the audience. A golden age of entertainment and education we live in.
Technically if you are the center of the universe and you place the circle exactly between your axes and a mirror draw a line across then rotate the circle at it axis 137.5 degrees in accordance to the fibonacci sequence then draw one more line you will have the center of the circle ....
I like the second way. It can be done with the straight edge of a piece of paper, cut to length of chord and fold in half for center and use 90° corner or strike arcs from points that are equal distance from both sides of center that are longer than that distance, strike them over centerline. Where they intersect will connect to centerline perpendicular to chord. If you have the space, strike arcs from each end of chord that are longer than half the length of chord. Strike them on both sides of chord. Connect the two points of intersection, through the chord. That line segment will be perpendicular to chord AND divide it in half. Maybe a combination of methods 2 and 3 where you lay it out and make a template, but using more geometry and less origami.. Lol great tricks. All three have their merit.
The cord method is best for many contractors as that they will most likely have a Swanson speed square in their toolbelt. Although I myself am not a contractor, this is the method that I use for my DIY projects that require a center point in a round object, such as wood, metal, plastic, or even foamboard.
The best way I know is to use a special square which touches right the extents of the circle. The square has another staff at exactly 45 degrees, and you mark on it a short line close to the center and turn the circle a bit and repeat. I believe this method was found by Euclid ages ago.
Yes, we made an engineers variant in school metalwork, c. 1972, UK. Using 4 or 5 mm mild steel or brass sheet, make a three-quarter pie shape, with dead square cut out quarter, fix another (long, triangular is neatest) piece to it bisecting the 90 degrees, obviously at 45. We did this by 'secret rivetting' - the thing we were being assessed on. (Thank you Mr Payne). You can use this to find the centre of a cylinder end or round bar too. Good ideas here and useful if accuracy isn't paramount! And yeah, get millimetres - but then you'll spell it wrongly!
My preferred method also. Any carpenter or woodworker has two squares, on of them with a 45. Just overlay the 2 squares and you have the tool to use the method you describe.
Take sheet of paper that's shorter then the circles diameter, fold the paper perfectly in half and crease it good. Now unfold the paper and set it so both bottom corners exactly touch the outside of the circle, mark a little dot on the circle at the end of the crease toward the outside edge of the circle, do the same on the other end towards the center. Line those two dots up with a ruler and draw a line. Turn the circle 120 degrees or so, doesn't have to be perfect, and repeat the dots and line again with the creased paper, where those two lines intersect is the exact dead on balls center.
I recently had to find the center of about 20 wood circles. I had cut a 2" dowel into 20 segments and wanted to drill a hole in the center of each. In Photoshop I created a 2 inch circle with 2 90 degree radii (crosshair) and printed it out. I cut out the circle, placed it over the dowel, held it up to a light to make sure it was centered, and poked through the crosshair into the dowel with an awl.
Using your ideas, I moved a ruler up and down near the center line to find the widest point, took that measurement, and drew a line. I then did another cross line of the same length. The intersection was the center.
Awesome video! I love how you took everybody’s comments and suggestions, tested them all out and found the best solutions, along with shouting out each contributor. THIS is how the internet/RUclips should be, showcasing the best of everybody’s collective ideas, not just one person showing everyone how THEY think it should be done.
Nestle the circle into your framing square. Mark the two contact points on the circle and square. Rotate the square so the marks line up but the angle of the square is inside the circle. The sides of the square are radii and they meet at the center of the circle. You can use the measurements on the square instead of marking anything if you prefer. Just line up the measurements on the square with the edge of the circle for the same result.
Instructions unclear. What does "Rotate the square so the marks line up but the angle of the square is inside the circle" mean? Do you mean flip the square?
I figured out two ways to do this just now by thinking about it. Use a compass, open it to what appears to be a decent amount wider than what the center of a circle would be, set 1 compass point at the outer perimeter of the circle, they carefully draw an arc. Do that at 2 more points afterward. They look for the co-created convex shapes created, draw a line joining them, and you have center. Another way is to box the circle in with a framing square. Go in a linear perimeter by drawing upper right, then upper left, then lower left, then lower right (or whichever direction you wish so long as you keep right angles). Then simply connect the 4 box corners.
Thanks for the video. Of the three, I believe the first was my favorite, however if not having marks on your project is a factor, then the last would be the one.
Take a compass, set any length that is less than the radius of the circle, now place the point anywhere on the edge of the circle and scribe an arc in the circle. Do this four times, the points from which you do it do not have to be exactly opposite just roughly, at the points where the arcs intersect, (you should have four) draw lines that pass through opposite points, where these lines intersect is the centre. This works even for circles where you can’t make a template, where a square won’t fit, etc.
Measure the diameter with calipers. Divide to find the radius and set your compass to the radius. Draw arcs from the edge and the arcs will find the center where they cross in the middle.
I REALLY liked the paper template idea! To me with dyslexia reading numbers is not a good way. The circle eliminates the possibility that I boogered the numbers when reading them!
I've had great success using a compass. I measure the diameter then set compass to half the diameter. Set the compass on the edge and draw a small arc. Move compass to a second point close to 90 degrees from first point and draw a second arc. The point where the 2 arcs intersect is center. It doesn't matter how far the 2nd arc is from the first, but if it is somewhere near 90 degrees they will cross more perpendicularly and give you better precision. If you don't have a compass, you can use a piece of string and a paperclip and a pencil.
Parrish Westenberg you do have a compass, or you wouldn't be attempting this method. Place the point of the compass on the perimeter and adjust until the arc you draw intersects at the perimeter opposite the center and measure your compass and divide by 2. That gives you radius. 2 arcs at radius from perimeter at 90 degrees from each other will cross in the center. You can do three arc from 120 degree interval for a bit of error checking.
You have a framing square (you can even make a quick one by simply placing a ruler on the edge of a sheet of card, drawing a line, place the ruler on an adjoining edge, draw another line then cut out the L shape to give you a square). Place the square so the sides touch the outer edge of the circle. Place a ruler onto the square so an edge of the ruler touches the outer point and inner point of the square (a 45deg angle). Draw a line on your circle. Move the square around - even an inch or so is fine - and do the same again. Where the lines intersect, there is your centre. Repeat the process with another line if you wish to check.
I like #1 & #2. These 2 methods are great for us who prefer finding answers with simpler plane geometry and are also right brained, pictorial thinkers. Thank you and thanks for including 4 versions so we can find the easiest solution of the 4 to find the center of a circle. 😊. I also used the 2nd method. For me, it was the simplest.
Very nice. Thank you for that. The best ones are 1 and 2. The 3rd is ok but depending on the size of your circle you have to cut a new template everytime.
One way I find center of a circle when on the jobsite is to find the diameter of the circle with a tape measure ( hold the zero end of the tape on a point on the outside of the circle and move the other end until you hit the largest measurement. ) and make a line, then turn the circle 90 degrees and find that diameter, then the intersection is your center.
Built log homes 10+ years. Use torpedo and draw verticle down side 4,5, or 6 inches whatever works as long as it easily divides in two. Mark center of that line and use level to draw horizontal line threw it. Measure it and mark at halfway. Use level to draw verticle center line. You have center of log, and the needed vertical and horizontal center point of log. This is for anti-symmetrical handcrafted logs, turned logs are much easier.
Thank you, the third one is the fastest for me, out on the job and it is easy to carry the common sizes with me in 1/4 increments or something like that.
1. Use your square and place the corner of the 90 degree angle on the circumference of the circle. 2. Draw lines from the corner to the circumference along both arms. 3. Connect the end points of the 2 lines to form a triangle within the circle. The centre can then be determined in 2 ways i) repeat 1 and 2. The intersection point of the two hypotenuses is the centre of the circle. ii) from each end point of the hypotenuse, draw an arc of length greater than the radius of the circle and less than the diameter so that the arcs intersect above and below the hypotenuse. Connect the 2 intersection point of the arcs. The point where this line crosses the hypotenuse is both exactly half the length of the hypotenuse and also the centre of the circle. The theorem is that any 2 connecting chords that are at a 90 degree angle the hypotenuse of the triangle formed by the chords passes through the centre. It works the same as your first demonstration but you neither have to be precise in determining the square that fits in the circle nor measure distances as in the second demonstration. It works for any size connected chords at 90 degrees to each other on the circumference.
thump up from me for number 3 I had a knife and paper within reach when I watched the video - so in a few seconds I had a dot on the middle of my circle ( a round plastic cap that I'm making into a wheel for an rc model plane. Thank you.
Assuming you have a framing square, a simpler way would be to hook a tape measure slide it back and forth to find the longest diameter then lay framing square flat on table lay disk flat then slide up to inside corner of tongue and blade to mark, e.g. (6" diameter = 3" radius) Mark disk at 3" on tongue and blade then rotate disk 90° so only 1 mark is at 3 and then mark new 3. Do this 3 times to have 4 marks at 90° intervals then scribe line through opposing marks for center.
If you use a caliper you can measure the diameter of the circle and divide it in half to get the radius. Set a compass to the radius and draw two arcs centered at two different points on the edge. The two arcs will intersect at the center of the circle. If you don't have either a caliper or a compass you can substitute a ruler. When using a ruler instead of a caliper, be sure to measure across the circle where it is the largest. If you can adjust the ruler a bit one way or the other and get a larger measure, use that measure. When using a ruler instead of a compass, measure in from the edge perpendicular to the edge and mark off the radius. Do this from two points on the edge and the two marks should cross at the center if you were close enough to perpendicular.
To make sure if all three methodes are good, you must overlap the circles together to see if the cnters are aligned. The thickness of the pen allows an error of at least 0.5mm. so the best way to draw the center is by marking the paper with a very sharp knife.
How I love RUclips for this very reason! Just doing some DIY projects and this helped tremendously. I’d like to vote for the second example lol seems easiest with less work and fastest. Great video 👍👍👍👍
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I would just trace around a piece of paper and then fold it twice.
Real quick!😂
This is the real answer right here 😂
I'm sure that's helpful if you need the middle for a huge table top. I'll just fold it in half
I like the second. I never took geometry so my mind is blown on 2. Extremely useful, all i need to do is remember it in the future. Thank you.
These demonstrations are excellent! You made them so easy to follow and understand. Thanks for your effort and for sharing them. I really appreciate it.
Thanks for explaining and showing this with the paper or saying anything with a 90 degree angle. It sounds simple, but it seems like we forget all about angles of items and such when we need to remember. You explain things well and that means a lot coming from a special ed teacher.
You're very welcome! Happy to hear that
The 3rd method is the quickest and easiest, it's the one I always use. I'm not trying to impress anyone with needless geometry skills. Great infom on all 3.
here's a very simple solution: draw a straight line between any two points on the circle, find the line's center point and draw a line (again, from edge to edge) through that midpoint that is perpendicular to the original line. The new line is a diameter and its midpoint is the center of the circle.
Wow, that is really easy and precise.
@@joaovianna7321 thanks algebra
@Lance Bermudez No, this one involves drawing only two lines
@@zioxei His third chord in the video is superfluous. It only requires two. The third is a control to help mitigate stacking inaccuracies.
@@joeywatch1145 What you call the third line is actually the sixth line drawn. Lifulo is right
The 3rd one works best for my project because I have 5 circles to find the center of. Thank you!
All the 3 ways are best . I liked the 2nd way the most. Thank u so much.
Perfect. I'm getting ready to make spinning tops. I don't want them to wobble. The paper template idea is perfect.
Have fun!
Your practical demonstration is much better than a drawing.
thank you. The third method was the best for my situation
Person suggesting the third method comments "MUCH easier" - method takes by far the longest. Great. Thanks for the upper case MUCH.
I just came back to review your video. I cannot thank you enough! I really like the second chord method!
I'm in the middle of a project, and this is a problem I'm facing soon. The 3 solutions you shared make sense, and doing this no longer seems so daunting. Thanks for your help.
I was taught to use a compass set at the radius and draw two arcs in the centre and where they cross you’ll find the centre. Something like that, it’s been over 50 years since I was taught this in geometry class.
I measure from a outside point of the circle and find the largest measurement to find the diameter. Mark it then repeat in a different spot. Where they intersect is the center. You can do three to check your center.
I like this method!! Thanks for sharing!!
Example 2 is just what I need to re-find the center of my 20 foot round pool pad so I can do the final leveling. Thank you.
Pop through time-space into space-time, realize you are the circle, you are the center. Come back, share what you learned, get crucified. Take a nap, etc. Great video, very helpful and I love that you tried all the suggestions from the audience. A golden age of entertainment and education we live in.
Dude thats .... deep...... :) are you weaving hemp baskets all day long ??how do you even come up with this.. :)
Technically if you are the center of the universe and you place the circle exactly between your axes and a mirror draw a line across then rotate the circle at it axis 137.5 degrees in accordance to the fibonacci sequence then draw one more line you will have the center of the circle ....
Clown
🙌 Thank you so much! The paper template is perfect for me! I'm creating an art piece and can't put any obvious marks on the wood I'm using. ☮💜
Wonderful! Thank you so much for watching!
I like the second way. It can be done with the straight edge of a piece of paper, cut to length of chord and fold in half for center and use 90° corner or strike arcs from points that are equal distance from both sides of center that are longer than that distance, strike them over centerline. Where they intersect will connect to centerline perpendicular to chord. If you have the space, strike arcs from each end of chord that are longer than half the length of chord. Strike them on both sides of chord. Connect the two points of intersection, through the chord. That line segment will be perpendicular to chord AND divide it in half. Maybe a combination of methods 2 and 3 where you lay it out and make a template, but using more geometry and less origami.. Lol great tricks. All three have their merit.
1st way was definitely easier
The cord method is best for many contractors as that they will most likely have a Swanson speed square in their toolbelt. Although I myself am not a contractor, this is the method that I use for my DIY projects that require a center point in a round object, such as wood, metal, plastic, or even foamboard.
The best way I know is to use a special square which touches right the extents of the circle. The square has another staff at exactly 45 degrees, and you mark on it a short line close to the center and turn the circle a bit and repeat. I believe this method was found by Euclid ages ago.
Yes, we made an engineers variant in school metalwork, c. 1972, UK.
Using 4 or 5 mm mild steel or brass sheet, make a three-quarter pie shape, with dead square cut out quarter, fix another (long, triangular is neatest) piece to it bisecting the 90 degrees, obviously at 45. We did this by 'secret rivetting' - the thing we were being assessed on. (Thank you Mr Payne).
You can use this to find the centre of a cylinder end or round bar too.
Good ideas here and useful if accuracy isn't paramount!
And yeah, get millimetres - but then you'll spell it wrongly!
My preferred method also. Any carpenter or woodworker has two squares, on of them with a 45. Just overlay the 2 squares and you have the tool to use the method you describe.
Thanks bro for sharing this valuable knowledge on RUclips.😊😊😊
very informative and very easy instructions good video, i now have this in my memory bank Thanks
I always used the third method. Now I will use the 1st and especially the second method! Thanks for sharing Sir!
Very useful information, better than just entertainment channels.
Awesome technique! Paper template seems easiest of the 3! Thx
Thank you so much! I think I will be using the paper folding method. Been trying to figure this out for a while!
Cutting holes in the ends of a water drum to make a tumbling composter, this helped a lot, thanks, probably use the second method.
Glad it helped!
I always use the third method. It is much easy. I sew to sell and sometimes I fold the fabric circle and iron it to find the centre of my circle.
Thanks for sharing!
Take sheet of paper that's shorter then the circles diameter, fold the paper perfectly in half and crease it good. Now unfold the paper and set it so both bottom corners exactly touch the outside of the circle, mark a little dot on the circle at the end of the crease toward the outside edge of the circle, do the same on the other end towards the center. Line those two dots up with a ruler and draw a line. Turn the circle 120 degrees or so, doesn't have to be perfect, and repeat the dots and line again with the creased paper, where those two lines intersect is the exact dead on balls center.
Genius 🤩 Thanks for sharing. As well as to the smart contributors 🏆
Happy to help!
Thanks for the video! I love to see and compare clever ideas
I recently had to find the center of about 20 wood circles. I had cut a 2" dowel into 20 segments and wanted to drill a hole in the center of each. In Photoshop I created a 2 inch circle with 2 90 degree radii (crosshair) and printed it out. I cut out the circle, placed it over the dowel, held it up to a light to make sure it was centered, and poked through the crosshair into the dowel with an awl.
Using your ideas, I moved a ruler up and down near the center line to find the widest point, took that measurement, and drew a line. I then did another cross line of the same length. The intersection was the center.
2nd method... you saved my day !!!
Thank you BOSS
Looking at a glance, square in the circle is my type thanks. Live and learn.
Awesome video! I love how you took everybody’s comments and suggestions, tested them all out and found the best solutions, along with shouting out each contributor. THIS is how the internet/RUclips should be, showcasing the best of everybody’s collective ideas, not just one person showing everyone how THEY think it should be done.
Nestle the circle into your framing square. Mark the two contact points on the circle and square. Rotate the square so the marks line up but the angle of the square is inside the circle. The sides of the square are radii and they meet at the center of the circle. You can use the measurements on the square instead of marking anything if you prefer. Just line up the measurements on the square with the edge of the circle for the same result.
Instructions unclear. What does "Rotate the square so the marks line up but the angle of the square is inside the circle" mean? Do you mean flip the square?
the center of three lines trick is great!! thanks!!
I just used the fold method for a large lazy susan build........It worked out great ...thanks!!!
You are a very kind person my friend. Thanks for the video.
I like the second method the best. Thanks for sharing.
These are great. The template method is my fave
My circle is less then two inches and it has to be right on the money. Paper template is the way to go! Thanks for the easy method!!
Great video and very precise and informative Thank you.
Thank you! We're happy to hear you found it helpful
Very nice, Thank you. It would of been cool to drill holes in each and compare how close the methods are to each other.
Wedge the circle in the square, combine a framing square 45 on the inside and draw a line through the center . Rotate the circle and draw another.
Use a compass. Divide diameter length by 2. Set compass to that half length and score from various points (at least 3 pointers) on the circumference.
the Chord method is nice...I learned something new today, Thanks!!!
Perfect! Thank you and everyone else so much!
Awesome thanks! Now I can get back to my project. Number three is perfectly simple!
This is the only video that was to the point. Others wanted me to learn calculus first.
I figured out two ways to do this just now by thinking about it. Use a compass, open it to what appears to be a decent amount wider than what the center of a circle would be, set 1 compass point at the outer perimeter of the circle, they carefully draw an arc. Do that at 2 more points afterward. They look for the co-created convex shapes created, draw a line joining them, and you have center. Another way is to box the circle in with a framing square. Go in a linear perimeter by drawing upper right, then upper left, then lower left, then lower right (or whichever direction you wish so long as you keep right angles). Then simply connect the 4 box corners.
Thanks for the video. Of the three, I believe the first was my favorite, however if not having marks on your project is a factor, then the last would be the one.
Take a tape measure , put it on the edge, sweep it across the circle, find the diameter . Once you do stop and mark radius . Your done !
This video deserves a thousand likes
Take a compass, set any length that is less than the radius of the circle, now place the point anywhere on the edge of the circle and scribe an arc in the circle. Do this four times, the points from which you do it do not have to be exactly opposite just roughly, at the points where the arcs intersect, (you should have four) draw lines that pass through opposite points, where these lines intersect is the centre. This works even for circles where you can’t make a template, where a square won’t fit, etc.
Measure the diameter with calipers. Divide to find the radius and set your compass to the radius. Draw arcs from the edge and the arcs will find the center where they cross in the middle.
I REALLY liked the paper template idea! To me with dyslexia reading numbers is not a good way. The circle eliminates the possibility that I boogered the numbers when reading them!
Bless you Anthony, you know your limitations.
not accurate!!! a slight misalignment of the template edge to the material..boom not dead center..
Thank you for sharing. They were all useful.
I've had great success using a compass.
I measure the diameter then set compass to half the diameter.
Set the compass on the edge and draw a small arc.
Move compass to a second point close to 90 degrees from first point and draw a second arc.
The point where the 2 arcs intersect is center.
It doesn't matter how far the 2nd arc is from the first, but if it is somewhere near 90 degrees they will cross more perpendicularly and give you better precision.
If you don't have a compass, you can use a piece of string and a paperclip and a pencil.
3dw3dw How can you measure the diameter if the center point is unknown?!
Parrish Westenberg you do have a compass, or you wouldn't be attempting this method.
Place the point of the compass on the perimeter and adjust until the arc you draw intersects at the perimeter opposite the center and measure your compass and divide by 2.
That gives you radius.
2 arcs at radius from perimeter at 90 degrees from each other will cross in the center.
You can do three arc from 120 degree interval for a bit of error checking.
Hey - thanks for your video - I'll use the last method now!
You have a framing square (you can even make a quick one by simply placing a ruler on the edge of a sheet of card, drawing a line, place the ruler on an adjoining edge, draw another line then cut out the L shape to give you a square).
Place the square so the sides touch the outer edge of the circle. Place a ruler onto the square so an edge of the ruler touches the outer point and inner point of the square (a 45deg angle). Draw a line on your circle.
Move the square around - even an inch or so is fine - and do the same again. Where the lines intersect, there is your centre. Repeat the process with another line if you wish to check.
Wonderful tutorial. Great editing and video work. Now I know how to do this. Much Thanks.
wonderful I used the last one. So easy 🙂 Thank You
You're welcome 😊
Awesome video much more accurate then eyeballing it. Saves for next time.
I like #1 & #2. These 2 methods are great for us who prefer finding answers with simpler plane geometry and are also right brained, pictorial thinkers.
Thank you and thanks for including 4 versions so we can find the easiest solution of the 4 to find the center of a circle. 😊. I also used the 2nd method. For me, it was the simplest.
What is the 4th version?
I love you!! Thank you so much! I was having a hard time.
Glad I could help!
Very nice. Thank you for that. The best ones are 1 and 2. The 3rd is ok but depending on the size of your circle you have to cut a new template everytime.
Thanks for sharing!
One way I find center of a circle when on the jobsite is to find the diameter of the circle with a tape measure ( hold the zero end of the tape on a point on the outside of the circle and move the other end until you hit the largest measurement. ) and make a line, then turn the circle 90 degrees and find that diameter, then the intersection is your center.
Donald D Lucker II YOU RIGHT. EASIEST WAY EVER. HE IS TRYING TO MAKE IT MORE COMPLICATED AND THEN CALL IT (EASY) HAHA
Built log homes 10+ years. Use torpedo and draw verticle down side 4,5, or 6 inches whatever works as long as it easily divides in two. Mark center of that line and use level to draw horizontal line threw it. Measure it and mark at halfway. Use level to draw verticle center line. You have center of log, and the needed vertical and horizontal center point of log. This is for anti-symmetrical handcrafted logs, turned logs are much easier.
The last one works perfectly especially for plates!
Excellent video. Thank You Sir!
Excellent video and a great process
Very cool! Thanks!
Saludos, excelente explicación. Me ha sido muy útil tu video!... Un abrazo desde Venezuela
Jorge Matheus,
Si, la explicacion es sencilla.
Espero que esta bien y con buena salud en Venezuela.
Saludos de California.
Very helpful video. Thank you.
Thank you, the third one is the fastest for me, out on the job and it is easy to carry the common sizes with me in 1/4 increments or something like that.
nice work - thanks for sharing!
1. Use your square and place the corner of the 90 degree angle on the circumference of the circle.
2. Draw lines from the corner to the circumference along both arms.
3. Connect the end points of the 2 lines to form a triangle within the circle.
The centre can then be determined in 2 ways
i) repeat 1 and 2. The intersection point of the two hypotenuses is the centre of the circle.
ii) from each end point of the hypotenuse, draw an arc of length greater than the radius of the circle and less than the diameter so that the arcs intersect above and below the hypotenuse. Connect the 2 intersection point of the arcs. The point where this line crosses the hypotenuse is both exactly half the length of the hypotenuse and also the centre of the circle.
The theorem is that any 2 connecting chords that are at a 90 degree angle the hypotenuse of the triangle formed by the chords passes through the centre.
It works the same as your first demonstration but you neither have to be precise in determining the square that fits in the circle nor measure distances as in the second demonstration. It works for any size connected chords at 90 degrees to each other on the circumference.
Thanks so much. All are great, but 3rd Method has me laughing at its simple but brilliant cleverness! Kind Regards.
You made my day man! Many, many thanks.
I like the last sample. Good for those who has limitted tools at home
Thanks so much! 😊
I need to find the centre of some wooden drawer knobs, the last method looks the only viable one. Thanks.
thump up from me for number 3
I had a knife and paper within reach when I watched the video -
so in a few seconds I had a dot on the middle of my circle ( a round plastic cap that I'm making into a wheel for an rc model plane. Thank you.
Perfect! Helped me with my project!
Thanks man! I used the chords method to make a turn table from wood
I love method number 3, since I need to get center of a small circle.❤
Thanks for watching!
The last method is easy and fast compare to other method, I prefer the paper folding method. Thank great idea
Last method is clean ..easy can be used for future circles
Assuming you have a framing square, a simpler way would be to hook a tape measure slide it back and forth to find the longest diameter then lay framing square flat on table lay disk flat then slide up to inside corner of tongue and blade to mark, e.g. (6" diameter = 3" radius) Mark disk at 3" on tongue and blade then rotate disk 90° so only 1 mark is at 3 and then mark new 3. Do this 3 times to have 4 marks at 90° intervals then scribe line through opposing marks for center.
If you use a caliper you can measure the diameter of the circle and divide it in half to get the radius. Set a compass to the radius and draw two arcs centered at two different points on the edge. The two arcs will intersect at the center of the circle.
If you don't have either a caliper or a compass you can substitute a ruler.
When using a ruler instead of a caliper, be sure to measure across the circle where it is the largest. If you can adjust the ruler a bit one way or the other and get a larger measure, use that measure.
When using a ruler instead of a compass, measure in from the edge perpendicular to the edge and mark off the radius. Do this from two points on the edge and the two marks should cross at the center if you were close enough to perpendicular.
To make sure if all three methodes are good, you must overlap the circles together to see if the cnters are aligned.
The thickness of the pen allows an error of at least 0.5mm. so the best way to draw the center is by marking the paper with a very sharp knife.
Excellent methods. Ty for this
Glad it was helpful!
Super!! I loved third one.
Really good tips, but even more accurate if you use a sharp pencil rather than a marker pen
Great video! I needed it!!