Question

which angle is adjacent to ∠3?
(image of intersecting lines with angles labeled 1, 2, 3, 4, 5, 6)
options: ∠4, ∠5

Explanation:

Adjacent angles share a common vertex and a common side, with no overlapping interior. $\angle 3$ and $\angle 4$ share the vertex and a common side, and their interiors do not overlap. $\angle 5$ does not share a common side with $\angle 3$, so it is not adjacent.

Answer:

$\angle 4$