Sphere
From The Art and Popular Culture Encyclopedia
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| ==See also== | ==See also== | ||
| - | *[[3-sphere]] | ||
| - | *[[Affine sphere]] | ||
| - | *[[Alexander horned sphere]] | ||
| - | *[[Ball (mathematics)]] | ||
| - | *[[Banach–Tarski paradox]] | ||
| *[[Cube]] | *[[Cube]] | ||
| - | *[[Cuboid]] | ||
| - | *[[Curvature]] | ||
| - | *[[Directional statistics]] | ||
| - | *[[Dome (mathematics)]] | ||
| - | *[[Dyson sphere]] | ||
| - | *[[Hoberman sphere]] | ||
| - | *[[Homology sphere]] | ||
| - | *[[Homotopy groups of spheres]] | ||
| - | *[[Homotopy sphere]] | ||
| - | *[[Hypersphere]] | ||
| - | *[[Metric space]] | ||
| - | *[[Napkin ring problem]] | ||
| - | *[[Pseudosphere]] | ||
| - | *[[Riemann sphere]] | ||
| - | *[[Smale's paradox]] | ||
| - | *[[Solid angle]] | ||
| - | *[[Sphere packing]] | ||
| - | *[[Spherical cap]] | ||
| - | *[[Spherical helix]] | ||
| - | *[[Spherical sector]] | ||
| - | *[[Spherical segment]] | ||
| - | *[[Spherical shell]] | ||
| - | *[[Spherical wedge]] | ||
| - | *[[Spherical zone]] | ||
| - | *[[Spherical coordinates]] | ||
| *[[Spherical Earth]] | *[[Spherical Earth]] | ||
| - | *[[Zoll surface|Zoll sphere]] | ||
| {{GFDL}} | {{GFDL}} | ||
Revision as of 13:16, 3 December 2011
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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).
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