A compass can be used to bisect angles.

1. First, a circular arc that intersects both sides of the angle is drawn. The vertex of the angle acts as the arc's central point.
2. Points A and B are marked in the locations where the circular arc intersects the sides of the angle. These points are then used as the central points of two smaller circular arcs of the same radius that intersect one another inside the angle's opening.
3. The point of intersection of the two circular arcs is connected to the vertex of the angle. This ray is the angle's bisector.