Question

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

Answer 1

First, we'll find the volume of the hemispherical tank.
Volume of a hemisphere= 2*22*r^3(cubed)/(3*7) or simply, (2/3)πr.
=2*22*2.1*2.1/(3*7)
=407.484/21
=19.404 m^3 (cubed)
Now, we know that 1m^3 can hold 1000 litres of water. So,
19.404*1000=19404 litres of water.
Hope it helps.
HARRY POTTER FOREVER!
                                       

Answer 2

volume of hemispherical = 2/3×π×r3
r=d/2
r=4.2/2 =2.1
as per the formula = 2/3×22/7×2.1×2.1×2.1
=19.404 m3 (1m3=1000) litres. =19.404×1000
=19404 litres