Question

in the diagram below, lines $overleftrightarrow{jk}$ and $overleftrightarrow{lm}$ are ___.
a. parallel
b. perpendicular
c. skew

Explanation:

Step1: Identify angle between lines

The angle between lines $\overleftrightarrow{JK}$ and $\overleftrightarrow{LM}$ is marked as $90^{\circ}$.

Step2: Recall line - relationship definitions

Parallel lines have an angle of $0^{\circ}$ between them. Perpendicular lines have an angle of $90^{\circ}$ between them. Skew lines are non - coplanar and not parallel. Since the angle is $90^{\circ}$, they are perpendicular.

Answer:

B. perpendicular