STEP 2: Put the pin of a compass at the end of the line you want to bisect. Set the compass to more than half the length of the line, and draw an arc crossing the line.

Learn more about bisecting lines and angles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

The Greek mathematicians were fond of compass and straightedge constructions and discovered how to bisect an angle early in the process. Here's an animation of how that is done.