Jambmaths question:
An arc subtends an angle of 30oat the centre of a circle radius 12cm. Calculate the length of the arc
Option A:
6π cm
Option B:
2π cm
Option C:
3πcm
Option D:
9πcm
Jamb Maths Solution:
$\begin{align} & \text{Length of arc}=\frac{\theta }{{{360}^{\circ }}}\times 2\pi r \\ & l=\frac{30}{{{360}^{\circ }}}\times 2\pi \times 12cm=2\pi cm \\\end{align}$
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