The formula for the volume of a sphere, V, in terms of its radius, r, is:
V = 4/3πr3
We can rearrange this formula to make r the subject.
The formula for the radius of a sphere, r, in terms of its volume, V, is:
Calculate the radius, r cm, of a sphere which has a volume of 100 cm3.
Give your answer to 3 sig. figs.
r3 = 3 x 100 ÷ (4 x π) = 23.873
r = 3√23.873 = 2.8794 ≈ 2.88 cm (3 s.f.)