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Calculate and correct to three significant figures, the length of an arc subtends an angle…

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
Correct Answer: Option B
Explanation

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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