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[" Let "PQ" and "RS" be tangents at the extremities of diameter PR of a circle of radius "r" .If "PS" and RQ "],[" intersect at a point "X" on the circumference of the circle,then "2" r 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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