An arc subtends an angle of 30o at the centre of a circle radius 12cm. Calculate the length of the arc.
-
A.
6(pi)cm -
B.
2(pi)cm -
C.
3(pi)cm -
D.
9(pi)cm
Correct Answer: Option B
Explanation
Length or arc = (frac{theta}{360}) x 2(pi)r
= (frac{30}{360}) x 2 x (frac{22}{7}) x 12
= (frac{1}{12}) x 2 x (pi) x 2 = 2(pi)cm
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