An arc subtends an angle of 30<sup>o</sup> at the centre of a circle radius 12cm. Calculate the length of the arc.
6\(\pi\)cm
2\(\pi\)cm
3\(\pi\)cm
9\(\pi\)cm
Correct answer is B
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