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We call it *ball* center **O** and lightning **R** the set of points in space whose distance to the center is less than or equal to radius **R**.

Considering the complete rotation of a semicircle around an axis **and**, the sphere is the solid generated by this rotation. Thus it is bounded by a spherical surface and formed by all points belonging to that surface and to its interior.

## Volume

The volume of the ray sphere **R** It is given by:

## Spherical surface

The spherical center surface **O** and lightning **R** is the set of points in space whose distance to point O is equal to the radius **R**.

If we consider the complete rotation of a semicircle around its diameter, the spherical surface is the result of this rotation.

The spherical surface area is given by: