I divide my round by drawing cross hairs trough the center, then I estimate the center of the quarters, then the with dividers placed at say 3:00 ,like on a clock, and on the estimated center point I scribe a line. Then I repeat with my center on say 6:00 the intersection of the resulting arcs drawn through to the center is a section. Just repeat on the smaller portion. Divides a circle up nicely.
