Jambmaths question:
Calculate the length of an arc of a circle of diameter 14cm which subtends an angle of 90o at the centre of the circle
Option A:
$\tfrac{7\pi }{4}cm$
Option B:
$\tfrac{7\pi }{2}cm$
Option C:
$7\pi cm$
Option D:
14cm
Jamb Maths Solution:
$\begin{align} & \text{length of arc}=l=\frac{\theta }{360}\times \pi d\text{ (}d=diameter) \\ & l=\frac{90}{360}\times 7\pi =\frac{7\pi }{4}cm \\\end{align}$
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