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ICOSAHEDRON (Gr. e'IKOVL, twenty, and...

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Originally appearing in Volume V14, Page 275 of the 1911 Encyclopedia Britannica.
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See also:

ICOSAHEDRON (Gr. e'IKOVL, twenty, and Ebpa, a See also:face or See also:base) , in See also:geometry, a solid enclosed by twenty faces. The " See also:regular icosahedron " is one of the Platonic solids; the " See also:great icosahedron " is a See also:Kepler-See also:Poinsot solid; and the " truncated icosahedron " is an Archimedean solid (see See also:POLYHEDRON). In See also:crystallography the icosahedron is a possible See also:form, but it has not been observed; it is closely simulated by a See also:combination of the See also:octahedron and pentagonal See also:dodecahedron, which has twenty triangular faces, but only eight are equilateral, the remaining twelve being isosceles (see CRYSTALLOGRAPHY).

End of Article: ICOSAHEDRON (Gr. e'IKOVL, twenty, and Ebpa, a face or base)

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