Required accessories - pencil, compass, unmarked straightedge

Odd proportion angles (there is a proportion of the steam angles) of the3 (which may be 5,7,9, ...) and theelement(which can be any angle which is obtainable by means of compass and straightedge)base angle

The angle CAB can be obtained with a compass and unmarked ruler, he added angles (each have ) DAC and EAD, obtained angle EAB is thestarting angle

Merge points E (D, C, B) and get a longer ED (DC, CB)

Along the DC from the point C draw is normal that intersects the segment AB, the intersection is a point G

Divider AG and from point G draw a circular arc to a longer EA and H get the point, and the arc GH, join the dots G and H and get along GH

Longer GH (ED, DC, CB) are equal, the arc EB'scan be made smaller or larger with a constant radius AB, arc GH is thefirst circular arccan be made smaller or larger with a constant radius AGsecond circular arc

INCREASING THE ANGLE

the starting angle EAB add angle FAE get the angle FAB - continued in the next post