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O is the centre of the circle PQRS. PR and QS intersect at T POR...

Mathematics
WAEC 1997
O is the centre of the circle PQRS. PR and QS intersect at T POR is a diameter, ∠PQT = 42o and ∠QTR = 64o; Find ∠QRT
  • A. 68o
  • B. 64o
  • C. 42o
  • D. 32o
  • E. 22o.
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Correct Answer: Option A
Explanation
TQR = 90 - 42 = 48o
QRT = 180 - (64 - 48)
    = 180 - 112
    = 68o
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