Calculate and correct to three significant figures, the length of an arc subtends an angle of 70o at the center of the circle radius 4cm. [Take π = 22/7]

  • A 2.44cm
  • B 4.89cm
  • C 9.78cm
  • D 25.1cm
  • E 50.3cm
waec 1989mathematics

The correct answer is B. 4.89cm

Circumference of circle = 2πr = 2 x 3.14 x 4

= 25.1cm 360o = 25.1cm

70o = 25.1/360 x 70 = 4.89

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