In the diagram, segment PQ is a tangent to the circle at P and QRS is a straight line. The value of x is
A
25o
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B
30o
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C
35o
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D
40o
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Solution
The correct option is D40o 180o−∠QPS=∠PQS+PSQ [Exterior angle of a triangle is equal to sum of interior opposite angles] =350+x ∠RPQ=∠PSQ=x0 [Angles in the alternate segment] ∠TPS+∠SPR+∠RPQ=1800 [Linear pair] 35+x+65+x=180 2x=180−100 2x=80 x0=400