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JAMB Mathematics 1979 Question 3

Question 3

Mensuration of Plane Shapes

If the value of π is taken to be 22/7, the area of a semicircle of diameter 42m is

  1. A.5544m2
  2. B.1386m2
  3. C.132m2
  4. D.264m2
  5. E.693m2.
Show the answer and explanation

Answer: E (693m2.)

Explanation

The radius is 21m. Area = ½ × 22/7 × 21 × 21 = 693m².