perfect angle trisection elementary geometry Divide into 3 equal parts at any angle Ruler without compass scale

This book is published by automatic translation. If the mathematical expressions are different, actually Please make a figure. It is a method for dividing into three equal parts of a free angle. If applied, it may be possible to divide the arc into three equal parts.
1.6.2021
Of an arc whose angle is 180 degrees or more
Updated the trisection method.
If you divide the arc into two, it will be 180 degrees or less.
Dividing into 6 equal parts is the same as dividing into 3 equal parts.

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