Question

what is an angle that is adjacent to ∠4? (with a diagram of intersecting lines and angles labeled 1, 2, 3, 4)

Explanation:

Adjacent angles share a common vertex and side, and do not overlap. ∠4 shares a vertex and side with ∠3 and ∠1. Either is a valid answer.

Answer:

$\angle 3$ (or $\angle 1$)