Answer:
22°
Explanation:
The mnemonic SOH CAH TOA reminds you ...
Tan = Opposite/Adjacent
The side opposite the marked angle is 10; the side adjacent is 25, so we have ...
tan(?) = 10/25 = 0.4
? = arctan(0.4) ≈ 21.801° ≈ 22° . . . . . . using the inverse tangent function
The measure of the indicated angle is about 22°.