Question

A hemisphere of lead of radius 9cm is cast into cone of h= 72cm find radius of cone

Answer 1

vol. of hemisphere = vol. of cone
2/3 *pi *9*9*9 = 1/3*pi*r^2*72
r^2 = 9*9*9/36
r = 9/2
r = 4.5 cm

Answer 2

Radius of the base of the cone is 4.5 cm.