Question

$\sf \: A \: conical \: pit \: of \: diameter \: 3.5 \: m \: is \: 12 \: m \: deep. \: What \: is \: its \: capacity \: in \: kilolitres \: ?$

$\color{red} \boxed{ \sf \: Answer \: is \: 38.5 \: kilolitres }$
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Answer 1

$height \: of \: conical \: pit \: = h = 12m \\ \\ radius \: of \: conical \: pit \: = \frac{diameter}{2} \\ \\ = > \: \frac{3.5}{2} = 1.75m \\ \\ capacity \: of \: pit \: = \: volume \: of \: pit \: \\ \\ = > \frac{1}{3} \pi \: \: {r}^{2} h \\ \\ = > \frac{1}{3} \times \frac{22}{7} \times 1.75 \times 1.72 \times 12 \\ \\ = > 38.5 \: \: kiloliters$