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Question

In the given figure, PA and PB are the tangents to a circle with centre O. Show that the points A, O, B, P are concyclic.

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Solution

Here, OA=OBAnd OAAP, OABP (Since tangents drawn from an external point areperpendicular to the radius at the point of contact)OAP=900, OBP=900OAP+OBP=900+900=1800AOB+APB=1800 (Since,OAP+OBP+AOB+APB=3600)Sum of opposite angle of a quadrilateral is 180°.Hence, A,O,B and P are concyclic.

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