Question

which side is adjacent to ∠b?

Explanation:

Step1: Recall adjacent - side definition

In a right - triangle, for an acute angle, the adjacent side is one of the sides that form the angle (excluding the hypotenuse).

Step2: Identify sides for ∠B

For ∠B in right - triangle ABC, the sides forming ∠B are AB and BC. Since the hypotenuse is AB (the side opposite the right - angle ∠C), the adjacent side to ∠B is BC.

Answer:

BC