Question

name the two pairs of vertical angles in the figure. ∠1 and ? ∠2 and ∠2 ∠3 ∠4 (and the figure with angles 1,2,3,4 formed by two intersecting lines)

Explanation:

Vertical angles are pairs of non-adjacent angles formed by two intersecting lines, opposite each other.

1. For $\angle 1$, its opposite angle is $\angle 3$.
2. For $\angle 2$, its opposite angle is $\angle 4$.

Answer:

$\angle 1$ and $\angle 3$
$\angle 2$ and $\angle 4$