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

2.44cm

4.89cm

9.78cm

25.1cm

50.3cm

Correct answer is B

Circumference of circle = 2πr = 2 x 3.14 x 4
= 25.1cm 360^o = 25.1cm

70^o =

25.1/360

x 70 = 4.89

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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]