Sphere
From The Art and Popular Culture Encyclopedia
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| [[Image:Drawing by Étienne-Louis Boullée (1728 - 1799) .jpg|thumb|right|200px|''[[Cenotaph for Newton]]'' ([[1784]]) by French architect [[Étienne-Louis Boullée]]]] | [[Image:Drawing by Étienne-Louis Boullée (1728 - 1799) .jpg|thumb|right|200px|''[[Cenotaph for Newton]]'' ([[1784]]) by French architect [[Étienne-Louis Boullée]]]] | ||
| [[Image:Trylon, Perisphere and Helicline (Samuel H. Gottscho).jpg|thumb|200px|The [[Trylon and Perisphere]], two [[Modernist architecture|modernistic structures]] at the [[1939 New York World's Fair|New York World's Fair of 1939-1940]]<br> | [[Image:Trylon, Perisphere and Helicline (Samuel H. Gottscho).jpg|thumb|200px|The [[Trylon and Perisphere]], two [[Modernist architecture|modernistic structures]] at the [[1939 New York World's Fair|New York World's Fair of 1939-1940]]<br> | ||
Revision as of 20:01, 16 July 2013
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A sphere (from Greek σφαῖρα—sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the same distance r from the center point. This distance r is known as the radius of the sphere. The maximum straight distance through the sphere is known as the diameter of the sphere. It passes through the center and is thus twice the radius.
In higher mathematics, a careful distinction is made between the sphere (a two-dimensional spherical surface embedded in three-dimensional Euclidean space) and the ball (the three-dimensional shape consisting of a sphere and its interior).
See also
- Nature is an infinite sphere, whose center is everywhere and whose circumference is nowhere
- Cube
- Spherical Earth
- Spheres (Peter Sloterdijk)
