An arc subtends an angle of 30º 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
The correct answer is: 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 12 = 2\(\pi\)cm
There is an explanation video available .