RS Aggarwal - Mathematics

Book: RS Aggarwal - Mathematics

Chapter: 12. Circles

Subject: Maths - Class 10th

Q. No. 6 of Formative Assessment (Unit Test)

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In the given figure, PA and PB are the tangents to a circle with center O. Show that the points A, 0, B, P are concyclic.

Given : PA and PB are tangents to a circle with center O

To show : A, O, B and P are concyclic i.e. they lie on a circle i.e. AOBP is a cyclic quadrilateral.

Proof :


[Tangent at any point on the circle is perpendicular to the radius through point of contact]

OBP = OAP = 90°

OBP + OAP = 90 + 90 = 180°

AOBP is a cyclic quadrilateral i.e. A, O, B and P are concyclic.

[ As we know if the sum of opposite angles in a quadrilateral is 180° then quadrilateral is cyclic ]

Hence Proved.

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