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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