from your construction; your nonagon side turns out to be (1-sqrt3+sqrt2)R =0.6821627R true value should be 2R sin (40/2) =0.684040286R your central angle = 2 (arcsine((1-sqrt3+sqrt2)/2))=2(19.94)=39.88 degrees. theoretical error is about 0.28 % pretty accurate.
Awesome took a while to find this method, I knew it was possible but everyone used a protractor in their video, that's not geometry, geometry should not require numbers, only shapes. Thank for the video
At first I didn't understand your comment, but on second thought this method is useful if You're prevented from or choose not to measure degrees and use division.
@@mastervel7210 This method is useful to me because it can be layed out more accurate at any scale in the shop and only relies on the precision on two fixed points and a straight edge whereas, using a protractor relies on accuracy of the protractor and accuracy of laying it out in some cases can multiply error, plus this error is multiplied at scale
39.89 degrees is close, but not accurate. 360/9 = 40. Use stacked planetary gears with ratios based on multiples of 2,3 and 5 for absolute accuracy! I promise! You'll figure it out.
Hey, I just wanted to point out, that it is NOT POSSIBLE to construct a regular 9-gon only given straight edge and compass due to 'field theory' (or Galois Theory) in mathematics.. only n-gons where n = 2^f * p_1 * ... * p_r are constructible in this way, where the p_i 's are pairwise different Fermat prime numbers. This must be a very good aproximation though.
Amazing video! easy to understand and clear. Thank you so much!!
wonderful,i neve knew that this cannel existed
*_Arthur Geometry,your videos are very useful for me.._*
Thank you Thank you Thank you
A very good approximation of a regular nonagon
sounds like a spanish/irish accent. good video
my brain cells exploded in the 1st minute
Thx I did this for work
Thank you
Thanks again this really helps
Thank you 🙏
❤ thank you
Thanks for sharing
Thank you so much!
Thank you sir
Amazing 👍
THANK YOU VERY MUCH
from your construction; your nonagon side turns out to be (1-sqrt3+sqrt2)R =0.6821627R
true value should be 2R sin (40/2) =0.684040286R
your central angle = 2 (arcsine((1-sqrt3+sqrt2)/2))=2(19.94)=39.88 degrees.
theoretical error is about 0.28 % pretty accurate.
Inscribe a triangle for a reference. Since three triangles have as many vertices as one nonagon anyway.
This is more akin to drafting than to Euclidean 'construction'.
Thank you 💖
thnx dude.
it really helped me
Awesome took a while to find this method, I knew it was possible but everyone used a protractor in their video, that's not geometry, geometry should not require numbers, only shapes.
Thank for the video
At first I didn't understand your comment, but on second thought this method is useful if You're prevented from or choose not to measure degrees and use division.
@@mastervel7210 This method is useful to me because it can be layed out more accurate at any scale in the shop and only relies on the precision on two fixed points and a straight edge
whereas, using a protractor relies on accuracy of the protractor and accuracy of laying it out in some cases can multiply error, plus this error is multiplied at scale
I used compasses, but didn't get accurately. Not sure where I did wrong. I followed exactly like this video.
Superb
Thank you sou much
thank you very much, it certainly helped..
Well done, and thank you.
Amazing. This is what i am looking for aside from the general method. Thank you! 🙂
Thank you so much
Vous êtes bien
Great ❤️👍
It helps me 💓💓😘
thanks u sir
I read just now that the Nonagon and Heptagon are not constructible using straight edge and compass. Is this process simply an approximation?
Yes, it is an approximation, a way for hand-drawing it
No wonder I didn't get it accurate. OCD kicked in like theres no tomorrow when I'm drawing this two polygons.
I am not able to understand how it came for u. For me not happening... Please help me.
I'm late but start by learning 6, then 7, then 5, and then 9. It will be a much smoother learning curve :)
KEEP IT UP😊👌
Nice video
Super
Thanku
Can u show right angle triangle in nanogon
Do not call this a "regular" nanogon. The side lengths are not equal, nor the angles.
What do you mean? When he was inscribing the side he never changed the length of the arc and it came back perfectly
It's very, VERY close!
Master!! Sensei!! Teacher!!! THANK YOU SO MUCH
Thank you!
very good
CAD 99%
Wow
39.89 degrees is close, but not accurate. 360/9 = 40. Use stacked planetary gears with ratios based on multiples of 2,3 and 5 for absolute accuracy! I promise! You'll figure it out.
Kevin Thomas
Are you saying you can construct 40 degrees ?
Yeah... These arcs are a bit complex ( although petty ) compared to the simplicity of 360°÷9=40°
I'd like to see the FULL arcs drawn.
I followed this method using compasses but I didn't get it accurate
Poifecto
Please how to draw exactly measure example I need all edges want 60cm
This is another exercise, given the measure of one side, instead of inscribed in a given circle.
Amazing thanks very much for this one🖤
Thanks, and from that I know how to mark a circle with 18 points which is what I needed.
i dont get it i just can not get it right!!
never mind i got it with the 3rd try. OMG big thanks
Nice 👌💐💐😜🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩😃🥳😀😅 thanks
70th
kurwa daje lajka
تحيه لطلاب الهندسه المدنيه خضوري😂😂😂😂
This video should be called how to make a poker table
I TRIED IT 5 TIMES, BUT I'M ALWAYS OFF A FEW mm.
Hey, I just wanted to point out, that it is NOT POSSIBLE to construct a regular 9-gon only given straight edge and compass due to 'field theory' (or Galois Theory) in mathematics.. only n-gons where
n = 2^f * p_1 * ... * p_r
are constructible in this way, where the p_i 's are pairwise different Fermat prime numbers. This must be a very good aproximation though.
Spectacular.
Architecture pa
Idk how to mesure it 😢
Amazing thanks very much for this one🖤
Well done, and thank you.