Question 41

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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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