Chapter 1.4, Problem 32E

Classify as true or false:

a) If points $P$ and $Q$ lie in the interior of $\angle ABC$, then $\overline{PQ}$ lies in the interior of $\angle ABC$.

b) If points $P$ and $Q$ lie in the interior of $\angle ABC$, then $\stackrel{\leftrightarrow }{PQ}$ lies in the interior of $\angle ABC$.

c) If points $P$ and $Q$ lie in the interior of $\angle ABC$, then $\stackrel{\to }{PQ}$ lies in the interior of $\angle ABC$.