The solution of mathematical tasks in the ancient Greek

Trisection of angles

angle=0° - no solution

180°>angle>0° - general solution (consists of 4 parts)

the first part

1.initial conditions of angle CAB

2.caliper A- ( free) , gets the points D and E

3.straightedge ( ruler ) DE

4.caliper E-ED

5.caliper D-DE , gets the points F and G

6.straightedge ( ruler ) FG , gets the point H

7.caliper H-HD