A radius of a sphere is the distance from its centre to its surface. It is also half of the diameter.
If you know the circumference of a circle, you can calculate its radius.
Circumference divided by Pi divided by 2 = radius.
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The volume of a sphere with a radius of 4cm is about 268cm3
The volume of a sphere with a radius of 2cm is about 33.5cm3
A sphere with a radius of 24 cm has a volume of 57,905.84 cm3
The surface area of a sphere with a radius of 13ft is about 2,123.7ft2