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Sphere | ![]() |
A sphere is a perfectly symmetrical, three-dimensional geometrical object. In mathematics, the term refers to the surface or boundary of a ball, but in non-mathematical usage, the term is used to refer either to a three-dimensional ball or to its surface.
(source: Sphere. (2006, October 23). In Wikipedia, The Free Encyclopedia. Retrieved 17:30, November 3, 2006, from http://en.wikipedia.org/w/index.php?title=Sphere&oldid=83112299)
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