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GCE Mathematics 1989 Question 42

Question 42

Mensuration of Plane Shapes

Calculate, correct to three significant figures, the length of an arc subtends an angle of 70° at the centre of the circle radius 4cm. (Take π = 22/7)

  1. A.2.44cm
  2. B.4.89cm
  3. C.9.78cm
  4. D.25.1cm
  5. E.50.3cm
Show the answer and explanation

Answer: B (4.89cm)

Explanation

Arc = 70/360 × 2 × 22/7 × 4 = 4.89 cm.