Question: how many litres of water will a hemispherical tank hold whose diameter is 4.2m?
Answer: Volume of a hemisphere= 2*22*r^3(cubed)/(3*7) or simply, (2/3)πr. Now, we know that 1m^3 can hold 1000 litres of water. So, 19.404*1000=19404 litres of water.