Chapter 3: Q13 (page 86)
Reword Theorem 3-8 as two statements, one describing existence and the other describing uniqueness.
Short Answer
The existence is that 鈥渁 perpendicular line to another line consists of a point that is positioned on outer area of another line鈥. The uniqueness is that that 鈥渢he count of line is one that is perpendicular to another line also it consist of a point that is positioned on outer area of another line鈥.

