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

  • A 40o
  • B 70o
  • C 80o
  • D 140o
waec 2005mathematics

The correct answer is B. 70o

∠QPT = ∠QTP = 70o. Since ∠QTR = 140o

∠PRS = TSR = 1/2(180-40) = 70o

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