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Encyclopedia Britannica - Main :: I27-INV |
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ICOSAHEDRON (Gr. e'IKOVL, twenty, and Ebpa, a face or base) , in geometry, a solid enclosed by twenty faces. The " regular
icosahedron " is one of the Platonic solids; the " great
icosahedron " is a Kepler
Poinsot
POLYHEDRON ). In crystallography the icosahedron is a possible form, but it has not been observed; it is closely simulated by a combination of the octahedron
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) If you wish, you can link directly to this article.
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