To buy a second angle means we want to cut the angle in half. The first thing we are going to do is take our compass and place it on B. We are then going to draw an arc across both arms of the angle. Taking our compass we are now going to place it on this new arc and draw an interior arc. And without changing the width we are going to repeat this on the other side. We are these two arcs intersect, mark the point. And from our angle at B we are going to draw a line to this point of intersection. And here we can see we have constructed the bisector of the given angle A, B, C. Try this for yourself and we will see you in the next lesson.