Question

Calculate the surface area of a sphere whose volume is 4851 cm 3 ?

Answer 1

volume of sphere= 4/3*pi*r^3---(1)
given volume=4851 cm^3---(2)
(1)=(2)

4/3*22/7*r^3=4851

r^3=(4851*3*7)/(4*22)
after cancellation
r^3=(21/2)^3
r=21/2cm

surface area of sphere=4*pi*r^2
=4*22/7*21/2*21/2
=22*21*3
=1386square cm