Definitionn. any polyhedron having four plane faces
Last update: July 22, 2015
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This is one of the Platonic solids, and is treated in the article Polyhedron, as is also the derived Archimedean solid named the "truncated tetrahedron"; in addition, the regular tetrahedron has important crystallographic relations, being the hemihedral form of the regular octahedron and consequently a form of the cubic system. [Please select]
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Each of the four depressed areas forms a side of our tetrahedron and is occupied by an ocean. [Please select]
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] Suppose, for example, that we attempt to deal decoratively which such simple figures as the three lowest Platonic solids--the tetrahedron, the hexahedron, and the octahedron. [Please select]
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Round Mars describe a tetrahedron; the sphere including this will be Jupiter. [Please select]
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This regular solid of four-dimensional space consists of sixteen cells, each a regular tetrahedron, thirty-two triangular faces, twenty-four edges and eight vertices. [Please select]
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It will be noted that these are the two dimensional correlatives of the sphere, the tetrahedron and the cube, mentioned as being among the determining forms in molecular structure. [Please select]
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Today, no less than in the past, the tetrahedral form of the earth and the relation of the tetrahedron to the poles and to the equator preserve the conditions that favor rapid evolution. [Please select]
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