Two important technique ices that we must learn to do with a ruler and a pair of compasses is to bisect a line and bisect an angle. Let’s watch the teacher demonstrate each of these on the board and then we will try it ourself.

Exercise

In the first exercise (3C on pages 40 and 41) we will be bisecting lines, and then in the second exercise (3D on pages 41 and 42) we will be bisecting angles:

Bisecting Lines:

Bisecting angles: