Correct Answer: Option A

Explanation

∠PSQ = 90° (∠ in semi circle)
∠PSQ + ∠QSR = 145°
90 + ∠QSR = 145
∠QSR = 145 - 90
∠QSR = 55°
BUt x° = ∠QSR (∠s in the same segment)
∴x° = 55°

There is an explanation video available below.

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