Mathematics for IGCSE & O level - Mensuration (Section 4 - No. 39)
If the radius of a sphere is doubled, how does its volume change?
It doubles.
It triples.
It quadruples.
It increases by a factor of 8.
Forklaring
Volume of a sphere = 4/3πr³. If r is doubled, the volume becomes 4/3π(2r)³ = 8 * (4/3πr³).