Mathematics for IGCSE & O level - Mensuration (Section 6 - No. 50)

If the radius of a sphere is halved, what is the ratio of the new volume to the original volume?

1:2

1:4

1:8

1:16

Volume of a sphere = 4/3πr³. If radius is halved, volume becomes (4/3)π(r/2)³ = (1/8) * 4/3πr³.