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Let PQ and RS be tangents at the extremi...

Let PQ and RS be tangents at the extremities of the diameter PR or a circle of radius r. If PS and RQ intersect a point X on the circumference of the circle, then prove that `2r=sqrt(PQxxRS)`.

A

`sqrt (PQ.RS)`

B

`(PQ+RS)/2`

C

`(2PQ.RS)/(PQ+RS)`

D

`sqrt((PQ^2 +RS^2)/2)`.

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