Finding 30, 60 and 90 Degrees Using A Compass.
0:08 I drew a line however this could be the edge of a piece of wood or sheet material.
0:16 Drawings first semi circle
0:22 Keeping the compass at the same length draw a further two arcs.
0:32 Draw a further two arcs which will create three intersections.
1:00 From the initial centre point you can draw lines to all the intersecting arcs which will create 30 degree spacing over 180 degrees.