Sphere

A sphere is a three-dimensional shape that is perfectly round, with all points on its surface equidistant from its center. It is similar to a circle in two dimensions, but exists in three dimensions. The surface of a sphere is called a "sphere." The distance from the center of the sphere to any point on the surface is the radius of the sphere.

The formula for the volume of a sphere is:

V = (4/3) * π * r³

Where V is the volume and r is the radius of the sphere.

The formula for the surface area of a sphere is:

A = 4 * π * r²

Where A is the surface area and r is the radius of the sphere.

These formulas can be used to calculate the volume and surface area of a sphere when the radius is known. The value of π is approximately 3.14159.