waecmaths question:
The curve surface area of cylindrical tin is 704cm2. If the Radius of its base is 8cm. Find the height? [Take $\pi =\tfrac{22}{7}$]
Option A:
14cm
Option B:
9cm
Option C:
8cm
Option D:
7cm
waecmaths solution:
$\begin{align} & \text{Curved surface area of cylinder is by }2\pi rh \\ & A=2\times \frac{22}{7}\times 8cm\times h=704c{{m}^{2}} \\ & h=\frac{704\times 7}{2\times 22\times 8}=14cm \\\end{align}$
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