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WAEC Mathematics 1993 Question 14

Question 14

Mensuration of Plane Shapes

A sector of a circle of radius 9cm subtends angle 120° at the centre of the circle. Find the area of the sector to the nearest cm2 (Take π = 22/7).

  1. A.75cm2
  2. B.84cm2
  3. C.85cm2
  4. D.86cm2
  5. E.95cm2
Show the answer and explanation

Answer: C (85cm2)

Explanation

Area = (120/360) × 22/7 × 9 × 9 = 84.86, which is 85 cm2 to the nearest cm2.