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WAEC Mathematics 2007 Question 47

Question 47

Mensuration of Plane Shapes

Two circles have radii 16 cm and 23 cm. What is the difference between their circumferences? (Take π = 22/7)

  1. A.244.92 cm
  2. B.149.92 cm
  3. C.44.00 cm
  4. D.43.96 cm
Show the answer and explanation

Answer: C (44.00 cm)

Explanation

Difference = 2π(23 − 16) = 2 × 22/7 × 7 = 44.00 cm.