Question 16

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waecmaths question: 

The diameter of a bicycle wheel is 42cm. If the wheel makes 16 completes revolutions, what will be the total distance covered by the wheels (Take$\pi =\tfrac{22}{7}$)

Option A: 

672cm

Option B: 

1056cm

Option C: 

2112cm

Option D: 

4224cm

waecmaths solution: 

$\begin{align}  & Perimeter\text{ }of\text{ }the\text{ }circle=\pi d=\tfrac{22}{7}\times 42cm=132cm \\ & \text{Total distance in 16 completes revolution is }16\times 132cm=2112cm \\\end{align}$

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