sphere
A sphere is a three-dimensional shape with a circular face. It has no vertices or sides. Every point on the surface of a sphere is equidistant from the centre of the sphere.
The formula for the volume of a sphere is:
In this formula represents the radius of a sphere. This is the distance from the centre of the sphere to any point on the surface of the sphere.
The formula for the surface area of a sphere is:
Snooker balls are examples of congruent spheres.