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Sphere (617 words) |
 | More precisely, a sphere is the set of points in 3-dimensional Euclidean space which are at distance r from a fixed point of that space, where r is a positive real number called the radius of the sphere. |
| For this reason, the sphere appears in nature: for instance bubbles and small water drops are spheres, because the surface tension tries to minimize surface area. |
| The circumscribed cylinder for a given sphere has a volume which is 3/2 times the volume of the sphere, and also a surface area which is 3/2 times the surface area of the sphere. |
| Circumscribed sphere - Wikipedia, the free encyclopedia (62 words) |
| A circumscribed sphere is a sphere that encloses another solid object, such as a polyhedron. |
| Any tetrahedron may have such a sphere drawn through its vertices. |
| It is the three dimensional version of a Circumscribed circle. |
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