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WAEC Mathematics 2019 Question 29

Question 29

Mensuration of Plane Shapes

Find the angle which an arc of length 22 cm subtends at the centre of a circle of radius 15 cm. [Take π = 22/7]

  1. A.70°
  2. B.84°
  3. C.96°
  4. D.156°
Show the answer and explanation

Answer: B (84°)

Explanation

22 = (θ/360) × 2 × (22/7) × 15, so θ = 22 × 360 × 7/(44 × 15) = 84°.