If you don’t have a compass, relax. Just find something straight and fairly short —a small pencil, a Tootsie Roll, a broken piece of uncooked spaghetti, whatever. Use it the same way as in Bisecting with a compass! In other words:

1. Put one end of it at the vertex; lay it down along a leg of the angle; make a mark at its end. Do the same thing on the other leg.

2. Slide the object’s lower end up to one mark, hold a
pencil’s point at the upper end, and rotate it slightly to make a curve between the angle’s legs. Do the same with the other mark so that the two curves intersect.

3. Connect the angle’s vertex to that intersection. You’re done!