You replace the radius in the formula, and do the calculations, to obtain either the volume or the area, depending on what formula you are talking about.
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The area of a sphere is equal to its circumference times its diameter.There are a variety of ways to work out this formula, most of them involving calculus.(See the links for the volume of a sphere).
Because when working out volumes the answer is given in cubic units and the radius in the formula for finding the volume of a sphere is cubed: Volume of a sphere in cubic units = 4/3*pi*radius3
Using the radius, the formula is: V = 4/3(PI*r3)
The formula for the surface area of a sphere is: 4 pi r 2
Surface area of a sphere = 4πr2