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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(P Q txx R S)`

B

`(P Q+R S)/(2)`

C

`(2 P Q xx R S)/(P Q+R S)`

D

`(sqrt(P Q^(2) xx R S^(2)))/(2)`

Text Solution

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The correct Answer is:
A
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