passwella.
Menu

WAEC Mathematics 2000 Question 47

Question 47

Mensuration of Plane Shapes

The area of a circle is 38.5cm2. Find its diameter. [Take π = 22/7]

  1. A.22cm
  2. B.14cm
  3. C.7cm
  4. D.6cm.
Show the answer and explanation

Answer: C (7cm)

Explanation

r2 = 38.5 × 7/22 = 12.25, so r = 3.5 cm and the diameter is 7 cm.