In the given figure, a circle is inscribed in a quadrilateral ABCD which touches the sides AB, BC, CD and DA at P, Q, R and S respectively. Prove that ∠ AOB + ∠ COD = 180°.

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Theorem on Tangent Perpendicular to Radius at Point of Contact | PadhAiPro

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TextTheorem on Tangent Perpendicular to Radius at Point of ContactCBSE PYQ

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