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[" Let "PQ" and RS be tangents at the ex...

[" Let "PQ" and RS be tangents at the extremities of the diameter PR of "],[" circle of radius "r" .If PS and RQ intersect at a point "X" on "t],[" circumference of the circle,then "2" r equals "],[[" (A) "sqrt(PQRS)," (B) "(PQ+RS)/(2)],[" (C) "(2PQ*RS)/(PQ+RS)," (D) "sqrt((PQ^(2)+RS^(2))/(2))]]

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