- icosahedra
- n. figure that has twenty facets, solid form with twenty faces
English contemporary dictionary. 2014.
icosahedra
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The fifty nine icosahedra — is a book written and illustrated by H. S. M. Coxeter, P. Du Val, H. T. Flather and J. F. Petrie. It enumerates the stellations of the regular or Platonic icosahedron, according to a set of rules put forward by J. C. P. Miller.The book was… … Wikipedia
Compound of two great icosahedra — Type Uniform compound Index UC52 Polyhedra 2 great icosahedra Faces 16+24 triangl … Wikipedia
Compound of five great icosahedra — Type Uniform compound Index UC53 Polyhedra 5 great icosahedra Faces 40+60 … Wikipedia
Compound of two icosahedra — Type Uniform compound Index UC46 Polyhedra 2 icosahedra Faces 16+24 triangles Edges … Wikipedia
Compound of five icosahedra — Type Uniform compound Index UC47 Polyhedra 5 icosahedra Faces 40+60 Triangles … Wikipedia
Crystal structure of boron-rich metal borides — Two single crystals of YB66 (1 cm diameter) grown by floating zone technique using (100) oriented seeds. In the top crystal, the seed (left from the black line) has same diameter as the crystal. In the bottom crystal (sliced), the seed is much… … Wikipedia
Icosahedron — In geometry, an icosahedron (Greek: eikosaedron , from eikosi twenty + hedron seat; IPA|/ˌaɪ.kəʊ.sə.ˈhi.dɹən/; plural: drons, dra IPA|/ dɹə/) isany polyhedron having 20 faces, but usually a regular icosahedron is implied, which has equilateral… … Wikipedia
Stellation — is a process of constructing new polygons (in two dimensions), new polyhedra in three dimensions, or, in general, new polytopes in n dimensions. The process consists of extending elements such as edges or face planes, usually in a symmetrical way … Wikipedia
Regular polytope — In mathematics, a regular polytope is a polytope whose symmetry is transitive on its flags, thus giving it the highest degree of symmetry. All its elements or j faces (for all 0≤ j ≤ n , where n is the dimension of the polytope) cells, faces and… … Wikipedia
Stellation — En géométrie, la stellation est un procédé de construction de nouveaux polygones (en deux dimensions), de nouveaux polyèdres en trois dimensions, ou, en général, de nouveaux polytopes en n dimensions. Le procédé consiste à étendre des éléments… … Wikipédia en Français
