Correct Answer: Option A

Explanation

∠RTS = 90o (∠ in semi circle)
∠UTS = 25o (∠ in alternate segment)
X + 90 + 25 = 180(sum of ∠s on a str line)
X + 115 = 180
X = 180 - 115
X = 65o

There is an explanation video available below.

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