Question

How many litres of water will a hemispherical tank hold if its diameter is 4.2 m

Answer 1

vol. of hemispheric tank
= 2/3*22/7*2.1*2.1*2.1
= 44*4.41
= 194.04 m^3
= 194.04*1000
= 194040 litres

Answer 2

volume of hemisphere =2/3πr^3
=2/3 x 22/7 x (4.2/2)^3
=19.404 m^3
=19404 litres