Question

How many litres of water will a hemispherical tank hold whose diameter is $4.2$ m?

Answer 1

Volume of hemispherical tank
$=\frac{2}{3}\pi r^3$ cubic units
$=\frac{2}{3}\times \frac{22}{7}\times 2.1\times 2.1\times 2.1$
$=2\times 22\times 0.1\times 2.1\times 2.1$
$=19.404{cm}^3$
$=19.404\times 1000000{cm}^3$
$=19404000{cm}^3$
$=\frac{19404000}{1000}$ litre
$=19404$ litre