How to find the center of any given circle - Maker Math #1
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- Опубликовано: 4 окт 2024
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Maker Math #1 - One of the methods I use to find the center of any given circle.
This is the first of a series of math based videos meant for Makers.
The Maker Math series will provide math tricks that convey ideas about the nature of shapes, materials, and measurement.
These principles can be used for any category of craft.
I hope to share my knowledge of geometry and other applicable math to help anyone interested in increasing their ability to make things.
#makermath
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WARNING:
This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume the responsibility for the results. Always think ahead. Every project you try is at YOUR OWN RISK. 
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You did a good job of explaining how to find the center point. I think you omitted a critical piece of information. You mentioned that the distance between the points of the compass are arbitrary, which is true. However, that distance does have one requirement. It must be greater than one-half the diameter of the circle. If the scribed arcs are less than or equal to the radius of the circle you will not be able to draw an intersection of those arcs.
That's correct. I guess I was assuming that the viewers would understand that it was implied.
@@Makebuildmodify I am sure you're correct that the viewers would understand, since the video does show the distance is greater than the radius. And if they didn't, they would soon figure it out by trial and error. :-)
A quicker way to do this is to use your framing square to inscribe a right triangle in your circle. The hypotenuse will always be a diameter. Because an inscribed angle of 90 has a central measure of 180. Draw two different diameters and presto, you've got the center located. No compass necessary.
Yes, I've used that particular method often. There are several methods for finding the center, each with there own advantages and disadvantages. The method in the video was use because it's a little easier to transfer over to the work. Thanks for watching!
the method shown reduces error.
by far the best example i've seen or used! Thank you!
Thanks!
OR make a square (line) around the circle, just touching the outer rings on paper.
Draw a box around the circle, and now just X the box corner to corner with lines to find center.
Yes, that works too!
Works easier
Good idia
I would use 2 pairs of parallel lines. Basically quite the same as urs, but my lines need zero measurements!
this deserves more views!
Thanks!
Do more, many more !!!!Make darker lines tho, was a bit hard to see.Bravo Brother :-)
Thanks! Darker lines is now on the list.
Learned that back in high school. I used it a lot since then. Surprising because most things I learned in school have zero use in the real world.
Yeah, same here. But the maths have helped me in the construction industry.
Gotta remember that!! I think I learned that in drafting, but totally forgot!
It's a good one to have tucked away in your brain parts.
I need a way to mark the centre of a rod onto a flat surface.
It's a floating shelf bracket with steel tubes welded at a certain distance apart.
So I need to know precisely where the centres are and mark that on the edge of the shelf.
Be careful and take your time.
Specifically, what compass are you using? It looks great, accurate, and highly adjustable! It can't be that Alvin you have listed.
It's an older compass that I purchased on eBay. But I have an Alvin like the one in the description and it's easier to use than the one in the video.
love this stuff! now to remember it for when I need it.
That's the tough part
Very useful! Thank you ;-)
Glad to hear that!
You're welcome
Thanks for sharing this, I like to learn new things and you just helped me with a problem and gained a new sub, keep up the great work!
Thank you for the feedback and watching my videos!
This is awesome! Thank you sm
Glad you like it!
awesome method.
Thanks!
Or trace the circle on paper like that. Carefully cut the circle out and then fold the paper in half each way. Where the folds meet is the center
Yes! that's another great way to do it!
Excellent 👍👍
Thank you 👍
Very interesting sir
Thanks!
Thank you very muchhh.. You help me a lot
Any time. Thanks for watching!
Another way to do it, might be a bit less precise but faster. Draw a straight line through the circle just like you did, but instead of using a compass, you can find the middle of that line inside of the circle. Then you trace a 90degre line right on the middle you just found. Repeat that process with a second random line throught the circle and your two 90degre lines will cross right in the middle of the circle.
It can be a good compromise if you don't have a compass
Yes, this is another good way to do it. If you take your time it can be accurate too. Thanks for watching!
Thats cool!
Thanks for watching, Andrew!
Thanks a lot
You're welcome!
Can't see the lines drawn by the compass.
Sorry about that.
Sounds like too much trouble, I think I'll eyeball it lol. But good video, thanks
Haha! You bet. Thanks for watching!
A ruler n pencil can do that too! 🙂
Yup.
just fold the paper so the circle is divided in half by lining up the two half circles on top of each other. this will give a line right down the center if the circle. Now fold it again at a right angle to the first by lining up the first folds and circle halves on top of each other and there is your center. No need for compasses and all that fancy geometry.
Please be nice in my comment section.
Make Build Modify I didn't know I wasn't. Sorry if you thought I wasn't, I was just offering a simpler way for simple people like me.
Fair enough. Thanks for letting me know.
And how will you do this is the circle is drawn on something other than paper, like drywall for a recessed light, or plywood in this example? =)
Another method (according to Ye Olde PERL Principle "there is more than one way to do it") would be to use Thales' theorem first.
Take a set square or anything with a right angle and draw two right-angled triangles in the circle, i.e. first draw the legs from any point on the circle with a right angle between them, then draw the hypotenuse between the two points where the legs meet the circle.
The point where the two hypotenuses meet is the center of the circle, so now you can take the circles radius with the compasses and draw the circle where you need it.
A much easier method is to draw 4 arcs with the compass. Adjust the compass to mak an arc from the radius of the circle to a little past the imagined center of the circle. Draw n arc from the 3,6,9, and 12 o'clock positions( close enough is good enough ..As perfect circle has an infinite amount of points around the circumference).
Lastly draw a line using the straight edge through the opposite interesting arcs. The line intersection will always center of the circle.
You can also try to intentionally miss align the 4 points along the radius and it will still work out...
GOOD DAY!
Thanks.
I am sure that you are right in theory, but as we cannot see your lines clearly you are of little help.
I appreciate the feedback but not the way in which it was given.