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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 of a circle of radius r. If PS and RQ intersect at a point X on the circumference of the circle, then 2r equals

A

`sqrt(PQ. RS)`

B

`(PQ+RS)/(2)`

C

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

D

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

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A
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