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%ما هو (من)٪ 1 - تعريف

JOHNSON SOLID
Diminished icosahedron
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Great triambic icosahedron         
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  • 3D model of a great triambic icosahedron
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  • 3D model of a medial triambic icosahedron
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Medial triambic icosahedron
In geometry, the great triambic icosahedron and medial triambic icosahedron (or midly triambic icosahedron) are visually identical dual uniform polyhedra. The exterior surface also represents the De2f2 stellation of the icosahedron.
Disdyakis triacontahedron         
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  • Disdyakis triacontahedron
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CATALAN POLYHEDRON
Hexakis icosahedron; Decakis dodecahedron
In geometry, a disdyakis triacontahedron, hexakis icosahedron, decakis dodecahedron or kisrhombic triacontahedronConway, Symmetries of things, p.284 is a Catalan solid with 120 faces and the dual to the Archimedean truncated icosidodecahedron.
Icosahedron         
  • Progressions between an [[octahedron]], [[pseudoicosahedron]], and cuboctahedron. The cuboctahedron can flex this way even if its edges (but not its faces) are rigid.
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  • A [[tensegrity]] icosahedron
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  • Jessen's icosahedron
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  • [[Rhombic icosahedron]]
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  • Construction from the vertices of a [[truncated octahedron]], showing internal rectangles.
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POLYHEDRON WITH 20 FACES
Icosahedral; Eicosahedron; Icosahedra; Icosasphere; Icosohedron; Icosohedran; Snub tetrahedron; Gyroelongated pentagonal dipyramid; Vertices of an icosahedron; Icosihedron; 20-face; Great stellatriakis icosahedron; Snub tetratetrahedron; Pseudoicosahedron; Pseudoicosahedra; Birectified Dodecahedron; Pseudo-icosahedron; 20-hedron; Pyritohedral icosahedron; Isocahedron; Icosahedrons
·noun A solid bounded by twenty sides or faces.

ويكيبيديا

Gyroelongated pentagonal pyramid

In geometry, the gyroelongated pentagonal pyramid is one of the Johnson solids (J11). As its name suggests, it is formed by taking a pentagonal pyramid and "gyroelongating" it, which in this case involves joining a pentagonal antiprism to its base.

A Johnson solid is one of 92 strictly convex polyhedra that is composed of regular polygon faces but are not uniform polyhedra (that is, they are not Platonic solids, Archimedean solids, prisms, or antiprisms). They were named by Norman Johnson, who first listed these polyhedra in 1966.

It can also be seen as a diminished icosahedron, an icosahedron with the top (a pentagonal pyramid, J2) chopped off by a plane. Other Johnson solids can be formed by cutting off multiple pentagonal pyramids from an icosahedron: the pentagonal antiprism and metabidiminished icosahedron (two pyramids removed), and the tridiminished icosahedron (three pyramids removed).