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JAMB Mathematics 1982 Question 18

Question 18

Mensuration of Plane Shapes

A sector of a circle is bounded by two radii 7cm long and an arc of length 6cm. Find the area of the sector.

  1. A.42cm2
  2. B.3cm2
  3. C.21cm2
  4. D.24cm2
  5. E.12cm2.
Show the answer and explanation

Answer: C (21cm2)

Explanation

Area of a sector = ½ × radius × arc length = ½ × 7 × 6 = 21cm².