Question

look at this diagram: if mo and pr are parallel lines and m∠mnq = 123°, what is m∠onl?

Explanation:

Step1: Identify vertical - angle relationship

$\angle MNQ$ and $\angle ONL$ are vertical angles.

Step2: Recall vertical - angle property

Vertical angles are congruent, so $m\angle ONL=m\angle MNQ$.

Answer:

$123$