In the figure shown, PQS is a straight line. What is the value of ∠...

MATHEMATICS

WAEC 2008

In the figure shown, PQS is a straight line. What is the value of ∠ PRQ?

A. 128°
B. 108°
C. 98°
D. 78°

Correct Answer: D. 78°

Explanation

∠ QPR + ∠ PRQ = ∠ RQS

(Sum of two interior angles of a triangle = Opposite exterior angles)

70^o + ∠ PRQ = 148

∠ PRQ = 148^o - 70^o

= 78^o

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