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WAEC Mathematics 1998 Question 37

Question 37

Mensuration of Plane Shapes

In the diagram, O is the centre of circle PRQ. The radius is 3.5cm and ∠POQ = 50°. (Take π = 3.142) Calculate, correct to three significant figures, the area of sector OPQ.

Diagram for this question
  1. A.3.403cm2
  2. B.5.350cm2
  3. C.10.99cm2
  4. D.157.1cm2
  5. E.175.0cm2.
Show the answer and explanation

Answer: B (5.350cm2)

Explanation

Area = 50/360 × 3.142 × 3.52 ≈ 5.35 cm2.