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In △PQS, by angle sum property,
X + X + 60° = 180°
⇒ 2X = 120° ⇒ X = 60°
Now, in □ PQRS, by angle sum property,
∠P + ∠Q + ∠R + ∠S = 360°
⇒ (60°) + (X + Y) + (X + Y) + (30°) = 360°
⇒ 2(X + Y) = 270° ⇒ X + Y = 135°
⇒ 60° + Y = 135°
⇒ Y = 135° - 60° = 75°
∴ X = 60° and Y = 75°.
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