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
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
Circumference of circle = 2πr = 2 x 3.14 x 4
= 25.1cm 360o = 25.1cm
70o = 25.1/360 x 70 = 4.89
Source: Myschool Past Questions Archive (Record #22413)