Question

A cylindrical tank has a height of 40 cm and a diameter of 70 cm. How many litres of water can it hold? (1000 cu cm = 1 litre)

Answer 1

Radius of cylindrical tank (r) $=\frac{\mathrm{Diameter}}{2}=\frac{70}{2}=35\mathrm{cm}$
Height of cylindrical tank (h) = 40cm
Volume of water that the cylindrical tank can hold = πr²h
$$\begin{gathered} =\frac{22}{7}\times 35\times 35\times 40 \\ =154000\mathrm{cu}\mathrm{cm} \\ =\frac{154000}{1000}\mathrm{litres}(1000\mathrm{cu}\mathrm{cm}=1\mathrm{litre}) \\ =154\mathrm{litres} \end{gathered}$$