waecmaths question:
A cylindrical container has a radius of 14cm and height 18cm.How many litres, correct to the nearest litres, of liquid can it hold? [Take $\pi =\tfrac{22}{7}$]
Option A:
11
Option B:
14
Option C:
16
Option D:
18
waecmaths solution:
$\begin{align} & V=\pi {{r}^{2}}h \\ & V=\tfrac{22}{7}\times 14cm\times 14cm\times 18cm \\ & V=11080c{{m}^{3}} \\ & 1000c{{m}^{3}}=1litre \\ & V=\frac{11080}{1000}litres=11.080litres \\ & \text{To the nearest litres }V=11litres \\\end{align}$
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