WAEC Mathematics 2015 Objective — Question 20
Question 20 of 50 from the West African Examinations Council (WAEC) Mathematics 2015 Objective paper, with the correct answer and a full explanation.
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Find the size of angle PRS.
- A. 76°
- B. 71°Correct
- C. 38°
- D. 33°
Explanation
∠SOR = 180−76 = 104° (angles on a straight line); since triangle ORS is isosceles (OR=OS), ∠ORS=∠OSR=(180−104)/2=38°. ∠PRS = ∠PRT+∠TRS = 33+38 = 71°.
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