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WAEC - Mathematics (2005 - No. 39)

In the diagram PQRS is a circle, |PT| = |QT| and ∠QPT = 70o what is the size of ∠PRS?
40o
70o
80o
140o

Explicaţie

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

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