Question 16

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waecmaths question: 

The curved surface surface of a cylinder 5 cm high is 110cm2. Find the radius of its base [Take$\pi =\tfrac{22}{7}$]

Option A: 

2.6cm

Option B: 

3.5cm

Option C: 

3.6cm

Option D: 

7.0cm

waecmaths solution: 

$\begin{align}  & \text{Curved surface area, }A=2\pi rh \\ & 2\pi rh=110c{{m}^{2}} \\ & 2\times \frac{22}{7}\times r\times 5cm=110c{{m}^{2}} \\ & r=\frac{110\times 7}{10\times 22}=3.5cm \\\end{align}$

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