Question

a) name the two pairs of vertical angles in the figure.
a) ∠1 and ?
∠2 and ∠2
∠3
∠4

Explanation:

Step1: Recall vertical angles definition

Vertical angles are opposite when two lines intersect.

Step2: Identify pairs in the figure

For $\angle1$, its opposite is $\angle3$; for $\angle2$, its opposite is $\angle4$.

Answer:

$\angle1$ and $\angle3$, $\angle2$ and $\angle4$