waecmaths question:
The wheel of a tractor has diameter 1.4m, what distance does it cover in 100complete revolution? [Take $\pi =\tfrac{22}{7}$]
Option A:
140m
Option B:
220m
Option C:
280m
Option D:
440m
waecmaths solution:
$\begin{align} & \text{Circumference of the wheel}=2\pi r=\pi d \\ & \therefore \text{ Distance covered in one revolution}=\pi d=\frac{22}{7}\times 1.4cm=4.4cm \\ & \text{In 100 revolution, the distance covered }100\times 4.4m=440m \\\end{align}$
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