Pronunciation: /sfɪər/ Explain
|Figure 1: Sphere||
A sphere is all points a given distance from a central point in
space. The distance of the surface of the sphere from the center is called the
|Equation of a sphere with the center at (0,0,0)||x2 + y2 + z2 = r2|
|Equation of a sphere with the center at (x0,y0,z0)||(x - x0)2 + (y - y0)2 + (z - z0)2 = r2|
|Volume of a sphere||v = 4/3 π r3|
|Surface Area of a sphere||s = 4 π r2|
|Table 1: Equations and formulas for spheres|
of a sphere in
is called a hypersphere. The equation for a
four-dimensional hypersphere is
(w - w0)2 + (x - x0)2 + (y - y0)2 + (z - z0)2 = r2.
A 2 dimensional sphere is called a
|Figure 2: Sphere showing a great circle and a small circle.||
A great circle is a
on a sphere with the same diameter as the sphere. Circles on a sphere that
are not great circles are called small circles. For more
information see Great Circle.
|Figure 3: Hemisphere||
A hemisphere is exactly half of a sphere. A hemisphere can
be created using any plane that
a diameter of the circle.
- Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented. pg 50. Translated by Noetling, William A.M, C.E.. www.archive.org. Silver, Burdett & Company. 1897. Last Accessed 12/31/2009. http://www.archive.org/stream/elementsofconstr00noetrich#page/50/mode/1up. Buy the book
- McAdams, David E. Circle. allmathwords.org. All Math Words Encyclopedia. Life is a Story Problem LLC. 3/12/2009. http://www.allmathwords.org/en/c/circle.html.
Cite this article as:
McAdams, David E. Sphere. 5/5/2011. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/s/sphere.html.
12/31/2009: Added "References". (McAdams, David E.)
12/5/2008: Changed 'equidistant' to 'a given distance'. (McAdams, David E.)
6/7/2008: Corrected spelling. (McAdams, David E.)
4/1/2008: Initial version. (McAdams, David E.)