How to draw a regular nonagon inscribed in a circle

How to construct an 9-sided polygon inscribed in a given circle.
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Dubbed by Frank Shaw.
Music by Antonio Fernández Ruiz. antoniofernandez.es/
#Geometry #HowtoDraw

[@glisztliszt2854]

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

[@chimmarachimdimdu7178]

wonderful,i neve knew that this cannel existed

[@niloos5317]

my brain cells exploded in the 1st minute

[@dolik107]

Amazing thanks very much for this one🖤

[@sdsds4145]

Well done, and thank you.

[@jgsj2]

thank you very much, it certainly helped..

[@erai4019]

Thx I did this for work

[@user-ve8xq1cf5o]

Spectacular.

[@surajbhimchan1001]

Thanks again this really helps

[@satheeshkumarpr4419]

Thank you Thank you Thank you

[@loubnamadani6348]

Thank you so much!

[@clarenz6027]

Thank you

[@monoman4083]

sounds like a spanish/irish accent. good video

[@evangamble3718]

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]

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]

@@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]

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

[@amruthaabi3585]

thnx dude.
it really helped me

[@motoosingh5706]

Thank you so much

[@tolgasarkc8334]

Thank you 🙏

[@mapskeys4045]

Amazing 👍

[@spiralstaircaseindia]

Thanks for sharing

[@maya97249]

❤ thank you

[@briichan]

Thank you 💖

[@user-mx5lc7sv5y]

Thank you sir

[@stan7956]

THANK YOU VERY MUCH

[@armin9269]

Thank you sou much

[@Enlightenchannel]

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

[@ArthurGeometry]

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

[@Bajinowhere]

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

[@spiralstaircaseindia]

Great ❤️👍

[@prakash-nz1uo]

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

[@librabys]

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

[@flachameleoningo8276]

Just A question:
How do people discover the way of drawing it, do they prove it somehow?

[@Bajinowhere]

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

[@anonymousefitz8736]

Can u show right angle triangle in nanogon

[@stan7956]

It helps me 💓💓😘

[@pa3752]

A very good approximation of a regular nonagon

[@stan7956]

KEEP IT UP😊👌

[@bijuminnu8951]

Please how to draw exactly measure example I need all edges want 60cm

[@ArthurGeometry]

This is another exercise, given the measure of one side, instead of inscribed in a given circle.

[@eremasisevuloni8046]

Nice video

[@sidhunaik4040]

very good

[@pinoyictlovers4032]

Thank you!

[@MathTidbits]

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]

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

[@comic4relief]

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

[@BlaiseKasongo-yk3sr]

Vous êtes bien

[@kynaplata816]

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

[@KRT054]

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]

Kevin Thomas
Are you saying you can construct 40 degrees ?

[@mastervel7210]

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.

[@sanjeevmittal3582]

Thanku

[@kri.shtieee]

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

[@ricardocarreon2028]

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

[@markdaniel8740]

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

[@hili467]

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

[@TheRojo387]

It's very, VERY close!

[@pathivadaharikrishna8727]

Super

[@Fur8002]

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

[@crowfromtheoak6688]

Poifecto

[@dziadurak564]

kurwa daje lajka

[@mariolegaspi681]

I TRIED IT 5 TIMES, BUT I'M ALWAYS OFF A FEW mm.

[@karlislagzdins4556]

i dont get it i just can not get it right!!

[@karlislagzdins4556]

never mind i got it with the 3rd try. OMG big thanks

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.

[@thrushita5886]

Nice 👌💐💐😜🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩😃🥳😀😅 thanks

[@mdjasimuddin6466]

Idk how to mesure it 😢

[@raystron]

CAD 99%

[@stevennoelnobleza4990]

Architecture pa

[@zik0v]

This video should be called how to make a poker table

[@fahmimo1786]

تحيه لطلاب الهندسه المدنيه خضوري😂😂😂😂

[@MAZEMIND]

70th

[@sdsds4145]

Well done, and thank you.

[@sidhunaik4040]

thanks u sir

[@dolik107]

Amazing thanks very much for this one🖤