Question

use the diagram to name a pair of perpendicular lines.
mk and ls
np and pq
pr and mk

Explanation:

Step1: Recall perpendicular - lines definition

Perpendicular lines intersect at a right - angle (90 degrees).

Step2: Examine the diagram

In the given diagram, we can see that lines $\overleftrightarrow{NP}$ and $\overleftrightarrow{PQ}$ intersect at point $P$ and the angle formed at $P$ is a right - angle (marked with a square symbol).

Answer:

$\overleftrightarrow{NP}$ and $\overleftrightarrow{PQ}$