Question

A cylindrical water tank is of base diameter 7m and height 2.1m. Find the capacity of the tank in litres.

Answer 1

vol of cylinder= pi r^H
3.14×3.5×3.5×2.1=80.77m^3

Answer 2

First, find the volume in m³

V=$\pi r^{2} h$

where r=dia/2 = 7/2 = 3.5m; h = 2.1m; $\pi = \frac{22}{7}$

V=$(22/7)*(3.5)^{2} * 2.1$

V=22*3.5*3.5*0.3

Using calculator,

V=80.85m³

Since 1m³=1litre

V=80.85 litres