Exercise 5 Page 404

We name a plane by picking three points that lie in that plane and are not collinear. There are three points that lie only in the green plane. F, G, and HHowever, these three points lie on the same line. There are another three points that lie in both the green and the blue plane. A, L, and B These three points are also in a straight line. Therefore, in order to name the plane, we need to pick two points that lie only in the green plane and one that lies in both planes, or vice versa. There are several ways to combine the points. Two possible combinations are as follows.