This is a short list of some common mathematical shapes and figures and the formulas that describe them. Two-dimensional shapes Sources: Three-dimensional shapes Sources: Sphere The basic quantities describing a sphere (meaning a 2-sphere, a 2-dimensional surface inside 3-dimensional space) will be denoted by the following variables is the radius, is the circumference (the length of any one of its great circles), is the surface area, is the volume. Surface area: Volume: Radius: Circumference: See also References Mathematics-related lists