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 January 6th, 2017, 05:43 AM #11 Member   Joined: Jan 2015 From: leskovac Posts: 39 Thanks: 0 - 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
 January 10th, 2017, 03:10 AM #12 Member   Joined: Jan 2015 From: leskovac Posts: 39 Thanks: 0 valid for the odd $\displaystyle a={3,5,7,9,11,...}$ Proper ninth angle 2.jpg - 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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