How to divide a circle into nine equal parts

Learn how to split a circle into 9 equal sectors and how to construct a regular nonagon inscribed in.
This UA-cam 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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[@StarNumbers]

Exactly!?

[@ArthurGeometry]

Aproximation

[@StarNumbers]

@@ArthurGeometry
Thanks. Yet, I am intrigued because I've read that some geo constructions of the 9 pointed star can be as close as 0.001% from exact. I think the property of the exact geo division of a circle (2, 3, 5 plus their 2x multiples) is an exceptional property because that is where integers and the transcendental numbers meet. Kinda existential...

[@veritas5008]

Clear, concise and accurate. Much appreciated! 👍

[@bhagyark4143]

Superb, thanks for simplifying it, was in need of it so much. God bless you.

[@BariumCobaltNitrog3n]

Making a centrifugal blower fan from scratch, I found some success with the compass, but needed a repeatable method of finding points around a circle. This method seems a bit nefarious using points outside the circle, but it seems to work. I'm now being told that there are infinite sets that are bigger than others. Thank you for this.

[@dirtdeodara5449]

This video is fantastic. Thank you for illustrating this process so clearly!

[@deongovender246]

Thank you, it works

[@wdwdHenry9022]

Bless you may the light shine upon you

[@MrTarrman]

phenomenon! thank you !

[@joyshankarrajkumar9024]

thank you👍

[@khushirana7249]

Thank you sir 🙏

[@emiliyanpaunov8620]

Thanks, that is great! What is the theory behind this method though?

[@AngryHybridApe]

Works great here. But I've done it step by step 6 times and it never comes out equal.

[@feelthewyrd]

It’s impossible to construct the angle 360/9 = 40 degrees using a straightedge and compass. (It is possible using a marked straightedge or a ruler.)
The problem comes down to trisecting angles. We can trisect our circle once, giving 120 degrees
Bisecting is always available so we get 60 and 30 degrees. But there’s no way to get 40 degrees without another trisection, which is impossible with a straightedge and compass.

[@maqboolahmad9301]

How you decide (calculate) Q-U, should be right distance for any circle can explain by calculations ,Please.

[@aditichakraborty4681]

I tried,EF is smaller than other🙃,in this picture also

[@beteart]

It happens to me too.

[@aditichakraborty4681]

😍

[@meenamooch]

im here in 2021 😎

[@BlissRemedy]

mmm googul pzza

[@francescagiacomelli5950]

I tried, this gave me 10 points not 9 o.o

[@AngryHybridApe]

I get unequal sections. I've tried it several times too.

[@mopoerapesminecraft]

smartest

[@oelekegel]

now i can draw a biblically accurate enneagram

[@HaydarALsadee]

فعلت ذلك اكثر من مره ولم يتساوى ابداً أنت تتلاعب في الفرجال لقد ركزت في ذلك جيداً ،، تتلاعب بهِ في النهاية عند استخراج 9 فروع تقوم بأبعاد الفرجال شيء بسيط عن خط التحديد وهذا الشيء البسيط هو الذي يقوم بمساواة الفروع ال9
لقد كشفتك أنت مخادع جيد

[@abdellahbellafqi3357]

يا صديفي هو ليس مخادعا فهو يعطي طرقا مبسطة لتقسيم الدائرة و التي نسميها بالتقريب و تكون نسبة الخطأ فيها ضئيلة جدا لا أقل من 0.5 في المئة لذا من الطبيعي أن يظيف قليلا جدا لتتساوى الأضلاع لأنه تقريب و إضافة لذلك فإن الطريقة نجحت معي جيدا