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JAMB Mathematics 1994 Question 30

Question 30

Mensuration of Plane Shapes

Calculate the perimeter, in cm, of a sector of a circle of radius 8cm and angle 45°.

  1. A.2π
  2. B.8 + 2π
  3. C.16 + 2π
  4. D.16 + 16π
Show the answer and explanation

Answer: C (16 + 2π)

Explanation

Arc length = 45/360 × 2π × 8 = 2π. The perimeter adds two radii: 2π + 16.