A sphere is a perfectly
round shape. Objects which are in the shape of a sphere are called
Balls, balloons and soap bubbles are often spherical. A
sphere is defined as the set of point P in space which are all the
same distance r from a fixed point O. O is the center of the sphere
r is its radius.
The area of the surface of the sphere is 4 π r2
The volume enclosed by the sphere is 4/3 π r3