Sphere volume formula derivation

The volume of a sphere is the amount of
three-dimensional space it occupies. It's
calculated using the formula V=r,
3
where V represents the volume, and r is
the radius of the sphere.
A sphere is a perfectly round
geometrical object in three-dimensional
space that is the surface of a ball. It's
defined as the set of all points that are a
given distance (the radius) from a given
point (the center). Think of a basketball
or a tennis ball; these are excellent
real-world examples.