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UI Post-UTME Mathematics 2012 Question 10

Question 10

Mensuration of Plane Shapes

Calculate the circumference and area of a circle of radius 10.5cm

  1. A.43cm, 80cm2
  2. B.36cm, 42cm2
  3. C.49cm, 109cm2
  4. D.66cm, 346cm2
Show the answer and explanation

Answer: D (66cm, 346cm2)

Explanation

C = 2πr = 2 × 22/7 × 10.5 = 66 cm; A = πr² ≈ 346.5 cm².