In the diagram PQRS is a circle, |PT| = |QT| and ∠QPT = 70o what is the size of ∠PRS?

In the diagram PQRS is a circle, |PT| = |QT| and ∠QPT = 70^o what is the size of ∠PRS?

A.

40^o

B.

70^o

C.

80^o

D.

140^o

View answer & explanation

Correct answer is B

∠QPT = ∠QTP = 70^o. Since ∠QTR = 140^o
∠PRS = TSR = 1/2(180-40) = 70^o

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