Pg 636 (568) - Q24
Points P, Q, and R lie in the same plane, but not necessarily in the same line. Therefore, Q could either be between P and R, so that PR is 7, or R could be betweenP and Q, so that PR is 5. OR, P, Q, and R can be the vertices of a 3-4-5 right triangle, with PQ the hypotenuse being 5, which would make PR equal to 3.