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Question

In the given figure, O is the centre of a circle and PT is the tangent to the circle. If PQ is a chord, such that ∠QPT = 50° then ∠POQ = ?


(a) 100°
(b) 90°
(c) 80°
(d) 75°

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Solution

(a) 100°Given, QPT=500and OPT=900(Tangents drawn from an external point are perpendicularto the radius at the point of contact)OPQ=OPT-QPT=900-500=400OP=OQ Radius of the same circleOQP=OPQ=400In POQ, POQ+OQP+OPQ=1800POQ=1800-400+400=1000

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