Question:
Tick (✓) the correct answer:
A circular well with a diameter of 2 metres, is dug to a depth of 14 metres. What is the volume of the earth dug out?
(a) 32 m3
(b) 36 m3
(c) 40 m3
(d) 44 m3
Solution:
(d) $44 \mathrm{~m}^{3}$
Diameter $=2 \mathrm{~m}$
Radius $=1 \mathrm{~m}$
Height $=14 \mathrm{~m}$
$\therefore$ Volume $=\pi \mathrm{r}^{2} \mathrm{~h}=\frac{22}{7} \times 1 \times 1 \times 14=44 \mathrm{~m}^{3}$