Problem: In the figure, PS = SQ = RS and AP = 30°. Find x.

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Correct Answer: ans: 90°
Explanation:
PS = RS
$\angle$SRQ = $\angle$SPR = 30°
$\angle$PSR = 120°
So, $\angle$QSR = 60°
Here, SQ = RS
SO, $\angle$SQR = $\angle$SRQ
As $\angle$QSR = 60°
$\angle$SQR = $\angle$SRQ = 60°
$\angle$x =180° – (60° + 30°) = 180° – 90° = 90°