Mathematics

Mathematics

Problem

In any cyclic quadrilateral PQRSPQRS, which one of the following statements is always true? a) ∠P−∠R=90∘\angle P - \angle R = 90^{\circ} b) ∠P+∠R=180∘\angle P + \angle R = 180^{\circ} c) ∠P+∠Q=180∘\angle P + \angle Q = 180^{\circ} d) ∠P=∠R\angle P = \angle R

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