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Catalan solid
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In mathematics, a Catalan solid, or Archimedean dual, is a polyhedron that is dual to an Archimedean solid. There are 13 Catalan solids. They are named after the Belgian mathematician Eugène Catalan, who first described them in 1865.
Image: Triakistetrahedron
Image: Triakisoctahedron
Image: Triakisoctahedron
Image: Disdyakisdodecahedron
Image: Disdyakisdodecahedron
Image: Triakisicosahedron
Image: Triakisicosahedron
Pentagonal icositetrahedron
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In geometry, a pentagonal icositetrahedron or pentagonal icosikaitetrahedron is a Catalan solid which is the dual of the snub cube. In crystallography it is also called a gyroid.
A geometric construction of the Tribonacci constant (AC), with compass and marked ruler, according to the method described by Xerardo Neira.
A geometric construction of the Tribonacci constant (AC), with compass and marked ruler, according to the method described by Xerardo Neira.
Image: Pentagonalicositetrahedronccw
Image: Pentagonalicositetrahedronccw
Image: Pentagonalicositetrahedroncw
Image: Pentagonalicositetrahedroncw