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January 6th, 2017, 04:43 AM   #11
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From: leskovac

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- compass $\displaystyle C_2F_6$ , from point $\displaystyle E_6$ , point $\displaystyle A_{12}$
- compass $\displaystyle C_2F_6$ , from point $\displaystyle E_7 $, point $\displaystyle A_{13}$
- straightedge , semi-line $\displaystyle C_2A_{11}$
- straightedge , semi-line $\displaystyle C_2A_{12}$

trisection is complete, any error !!!

this is true for angles $\displaystyle 180^o<\alpha<0^o $, larger angles of first division of the $\displaystyle 180^o$

are you ready for the process of construction of the regular polygon
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January 10th, 2017, 02:10 AM   #12
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From: leskovac

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valid for the odd $\displaystyle a={3,5,7,9,11,...}$


Proper ninth angle
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- straight line $\displaystyle A_1A_2$
- straightedge and compass ,$\displaystyle \frac{A_1A_2}{10}$ , point $\displaystyle A_4$ , $\displaystyle a+1$ , $\displaystyle a=9. followed by .9+1=10$
- straightedge and compass , $\displaystyle A_1A_3$ normal $\displaystyle A_1A_2 $ , angle $\displaystyle C_3C_1C_2=90^o$
- compass $\displaystyle A_1A_4$ , from point $\displaystyle A_5$
- straightedge , straight line $\displaystyle A_4A_5$
- straightedge and compass , bisection arc $\displaystyle A_2A_3$ , point $\displaystyle A_6$

YOU TRY TO KEEP ... Figure down

22.jpg
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