Exercise 10 Page 384

In this exercise we want to use the given diagram to name a point that is not coplanar with points $R,$ $S,$ and $T.$ Consider the given diagram.

Points $R,$ $S,$ and $T$ all lie in plane $V.$ Notice that they are not collinear, so they can be used to define $V.$ This means that any point not coplanar with these points has to also not lie in plane $V.$ Let's consider the diagram once again. This time we will mark all points that lie in plane $V$ and fade the ones that do not lie in this plane. We will also fade the lines, since we will not consider them.

The only faded point is point $W.$ This means that point $W$ is the only point in the diagram that is not coplanar with points $R,$ $S,$ and $T.$ Therefore, point $W$ is the only possible answer.