In the fiven figure three tangents TP, TQ, and AB are respectively drawn at the points P, Q and R to a circle. The semi-perimeter of tri.TAB is equal to:?


Here the tangents from a external point are equal
Hence PT = PQ , BR = PQ, AR = AQ
So ABT = AQ + QT + PT + PB + BR + AR = 2(AB +PT )
Hence semiperimeter  = ABT/2 = AB + PT

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