Volume of a sphere

The 12 cm marked here goes right across the sphere — that is the diameter. The formula needs the radius.

Half of 12 is 6, so r = 6 cm.

Cube the radius first. r³ means r × r × r, not r × 3: 6 × 6 × 6 = 216.

Then four-thirds of that, times π: 4/3 × 3.14 × 216 = 904.32.

So the volume is 904.32 cubic cm.