# How to Bisect an Angle Using a Compass

To bisect an angle, you use your compass to locate a point that lies on the angle bisector; then you just use your straightedge to connect that point to the angle’s vertex.

Try an example.

Refer to the figure as you work through this construction:

**Open your compass to any radius***r*, and construct arc (*K*,*r*) intersecting the two sides of angle*K*at*A*and*B.***Use any radius**Note that you must choose a radius*s*to construct arc (*A*,*s*) and arc (*B*,*s*) that intersect each other at point*Z.*

that’s long enough for the two arcs to intersect.*s***Draw line***KZ*and you’re done.