You can also calculate the volume of a ball from its circumference, using the formula:

Volume = Circumference^2 / 12

So if the circumference is C cm, the volume would be:

Volume = C^2 / 12 cm^3

For example, if the circumference is 62.83 cm (which corresponds to a radius of 10 cm), the volume would be:

Volume = (62.83 cm)^2 / 12 cm^3
     = 3,967 cm^3

Which is close to the value we got using the radius formula.
So either the radius or circumference can be used to calculate the volume of a ball, as long as you have one of the dimensions given.
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