Question

1. name two segment bisectors

Explanation:

Step1: Recall segment bisector definition

A segment bisector divides a line - segment into two equal parts.

Step2: Identify possible bisectors

Line $\ell$ bisects segment $PS$ (since it passes through the mid - point of $PS$ which is $R$). Also, point $R$ bisects segment $QS$ (as it divides $QS$ into two equal parts $QR$ and $RS$).

Answer:

Line $\ell$, point $R$