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How to draw a regular nonagon inscribed in a circle

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How to construct an 9-sided polygon inscribed in a given circle.
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This RU-vid channel is dedicated to teaching people how to improve their technical drawing skills. It focusses on drawing figures from the geometric plane to descriptive geometry and also different systems of technical drawing representation.
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Dubbed by Frank Shaw.
Music by Antonio Fernández Ruiz. antoniofernande...
#Geometry #HowtoDraw

Опубликовано:

4 сен 2024

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Комментарии : 76

@glisztliszt2854 4 года назад

Amazing video! easy to understand and clear. Thank you so much!!

@niloos5317 3 года назад

my brain cells exploded in the 1st minute

@kri.shtieee 4 года назад

*_Arthur Geometry,your videos are very useful for me.._*

@MathTidbits 2 года назад

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.

@TheRojo387 2 года назад

Inscribe a triangle for a reference. Since three triangles have as many vertices as one nonagon anyway.

@comic4relief Год назад

This is more akin to drafting than to Euclidean 'construction'.

@satheeshkumarpr4419 4 года назад

Thank you Thank you Thank you

@pa3752 4 года назад

A very good approximation of a regular nonagon

@chimmarachimdimdu7178 2 года назад

wonderful,i neve knew that this cannel existed

@erai4019 4 года назад

Thx I did this for work

@clarenz6027 5 лет назад

Thank you

@evangamble3718 5 лет назад

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

@mastervel7210 3 года назад

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.

@evangamble3718 3 года назад

@@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

@Bajinowhere 3 года назад

I used compasses, but didn't get accurately. Not sure where I did wrong. I followed exactly like this video.

@surajbhimchan1001 3 года назад

Thanks again this really helps

@ricardocarreon2028 4 года назад

Amazing. This is what i am looking for aside from the general method. Thank you! 🙂

@armin9269 Год назад

Thank you sou much

@maya97249 5 месяцев назад

❤ thank you

@tolgasarkc8334 4 года назад

Thank you 🙏

@prakash-nz1uo 5 лет назад

I am not able to understand how it came for u. For me not happening... Please help me.

@librabys 3 года назад

I'm late but start by learning 6, then 7, then 5, and then 9. It will be a much smoother learning curve :)

@KRT054 7 лет назад

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.

@PYTHAGORAS101 7 лет назад

Kevin Thomas Are you saying you can construct 40 degrees ?

@mastervel7210 3 года назад

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.

@user-ve8xq1cf5o 3 года назад

Spectacular.

@user-mx5lc7sv5y 4 года назад

Thank you sir

@loubnamadani6348 3 года назад

Thank you so much!

@jgsj2 3 года назад

thank you very much, it certainly helped..

@monoman4083 3 года назад

sounds like a spanish/irish accent. good video

@markdaniel8740 4 года назад

Do not call this a "regular" nanogon. The side lengths are not equal, nor the angles.

@hili467 4 года назад

What do you mean? When he was inscribing the side he never changed the length of the arc and it came back perfectly

@TheRojo387 4 года назад

It's very, VERY close!

@mapskeys4045 2 года назад

Amazing 👍

@stan7956 3 года назад

THANK YOU VERY MUCH

@amruthaabi3585 4 года назад

thnx dude. it really helped me

@briichan 4 года назад

Thank you 💖

@kynaplata816 3 года назад

Master!! Sensei!! Teacher!!! THANK YOU SO MUCH

@spiralstaircaseindia 3 года назад

Thanks for sharing

@Enlightenchannel 6 лет назад

I read just now that the Nonagon and Heptagon are not constructible using straight edge and compass. Is this process simply an approximation?

@ArthurGeometry 6 лет назад

Yes, it is an approximation, a way for hand-drawing it

@Bajinowhere 3 года назад

No wonder I didn't get it accurate. OCD kicked in like theres no tomorrow when I'm drawing this two polygons.

@sdsds4145 6 лет назад

Well done, and thank you.

@motoosingh5706 5 лет назад

Thank you so much

@dolik107 4 года назад

Amazing thanks very much for this one🖤

@sidhunaik4040 5 лет назад

thanks u sir

@stan7956 3 года назад

It helps me 💓💓😘

@spiralstaircaseindia 3 года назад

Great ❤️👍

@Fur8002 4 года назад

Thanks, and from that I know how to mark a circle with 18 points which is what I needed.

@pathivadaharikrishna8727 2 года назад

Super

@Bajinowhere 3 года назад

I followed this method using compasses but I didn't get it accurate

@BlaiseKasongo-yk3sr 9 месяцев назад

Vous êtes bien

3 года назад

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.

@stan7956 3 года назад

KEEP IT UP😊👌