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Question

In □PQRS, m∠P = 70°, m∠Q = 115° and m∠R = 75°. What is the measure of ∠S?

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Solution


We know that the sum of the angles of a quadrilateral is 360°
∴ In PQRS,
m P + m Q + m R + m S = 360°
⇒ 70° + 115° + 75° + m S = 360°
⇒ (70° + 115° + 75°) + m S = 360°
⇒ 260° + m S = 360°
⇒ m S = 360° – 260°
⇒ m S = 100°

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