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Possible Duplicate:
Why is the volume of a sphere $\frac{4}{3}\pi r^3$?

We know that the surface area of a sphere is $4\pi r^2$ and the volume is $\frac{4}{3}\pi r^3$, where $r$ is the radius of the sphere.

How does one prove these formulae?

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    ... and see also http://math.stackexchange.com/questions/625/why-is-the-derivative-of-a-circles-area-its-perimeter-and-similarly-for-sphere?rq=12012-10-21

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