Question 22

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waecmaths question: 

The height of a cylinder is equal to its radius. If the volume is 0.216π m3. Calcualte the radius

Option A: 

0.46m

Option B: 

0.60m

Option C: 

0.87m

Option D: 

1.80m

waecmaths solution: 

$\begin{align}  & V=\pi {{r}^{2}}h \\ & \pi {{r}^{2}}r=0.216\pi c{{m}^{3}} \\ & {{r}^{3}}=\frac{216}{1000}c{{m}^{3}} \\ & r=\frac{6}{10}cm=0.6cm \\\end{align}$

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