Required accessories - pencil, compass, unmarked straightedge

Odd proportion angles (there is a proportion of the steam angles) of the

**element** 3 (which may be 5,7,9, ...) and the

**base angle** (which can be any angle which is obtainable by means of compass and straightedge)

The angle CAB

can be obtained with a compass and unmarked ruler, he added angles (each have

) DAC and EAD, obtained angle EAB

is the

**starting 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's

**first circular arc** can be made smaller or larger with a constant radius AB, arc GH is the

**second circular arc **can be made smaller or larger with a constant radius AG

INCREASING THE ANGLE

the starting angle EAB add angle FAE

get the angle FAB

- continued in the next post