Metagyrate diminished rhombicosidodecahedronIn geometry, the metagyrate diminished rhombicosidodecahedron is one of the Johnson solids (J_78). It can be constructed as a rhombicosidodecahedron with one pentagonal cupola (J_5) rotated through 36 degrees, and a non-opposing pentagonal cupola removed. (The cupolae cannot be adjacent.
Bigyrate diminished rhombicosidodecahedronIn geometry, the bigyrate diminished rhombicosidodecahedron is one of the Johnson solids (J_79). It can be constructed as a rhombicosidodecahedron with two pentagonal cupolae rotated through 36 degrees, and a third pentagonal cupola removed. (None of the cupolae can be adjacent.
Gyrate bidiminished rhombicosidodecahedronIn geometry, the gyrate bidiminished rhombicosidodecahedron is one of the Johnson solids (J_82). It can be constructed as a rhombicosidodecahedron with two non-opposing pentagonal cupolae (J_5) removed and a third is rotated 36 degrees. Related Johnson solids are: The diminished rhombicosidodecahedron (J_76) where one cupola is removed, The parabidiminished rhombicosidodecahedron (J_80) where two opposing cupolae are removed, The metabidiminished rhombicosidodecahedron (J_81) where two non-opposing cupolae are removed, And the tridiminished rhombicosidodecahedron (J_83) where three cupolae are removed.
Elongated triangular cupolaIn geometry, the elongated triangular cupola is one of the Johnson solids (J_18). As the name suggests, it can be constructed by elongating a triangular cupola (J_3) by attaching a hexagonal prism to its base. The following formulae for volume and surface area can be used if all faces are regular, with edge length a: The dual of the elongated triangular cupola has 15 faces: 6 isosceles triangles, 3 rhombi, and 6 quadrilaterals. The elongated triangular cupola can form a tessellation of space with tetrahedra and square pyramids.
Pentagonal prismIn geometry, the pentagonal prism is a prism with a pentagonal base. It is a type of heptahedron with seven faces, fifteen edges, and ten vertices. If faces are all regular, the pentagonal prism is a semiregular polyhedron, more generally, a uniform polyhedron, and the third in an infinite set of prisms formed by square sides and two regular polygon caps. It can be seen as a truncated pentagonal hosohedron, represented by Schläfli symbol t{2,5}.
Rotunda (geometry)In geometry, a rotunda is any member of a family of dihedral-symmetric polyhedra. They are similar to a cupola but instead of alternating squares and triangles, it alternates pentagons and triangles around an axis. The pentagonal rotunda is a Johnson solid. Other forms can be generated with dihedral symmetry and distorted equilateral pentagons.
Elongated cupolaIn geometry, the elongated cupolae are an infinite set of polyhedra, constructed by adjoining an n-gonal cupola to an 2n-gonal prism. There are three elongated cupolae that are Johnson solids made from regular triangles and square, and pentagons. Higher forms can be constructed with isosceles triangles. Adjoining a triangular prism to a cube also generates a polyhedron, but has adjacent parallel faces, so is not a Johnson solid. Higher forms can be constructed without regular faces.
Truncated dodecahedronIn geometry, the truncated dodecahedron is an Archimedean solid. It has 12 regular decagonal faces, 20 regular triangular faces, 60 vertices and 90 edges. This polyhedron can be formed from a regular dodecahedron by truncating (cutting off) the corners so the pentagon faces become decagons and the corners become triangles. It is used in the cell-transitive hyperbolic space-filling tessellation, the bitruncated icosahedral honeycomb.
Elongated octahedronIn geometry, an elongated octahedron is a polyhedron with 8 faces (4 triangular, 4 isosceles trapezoidal), 14 edges, and 8 vertices. A related construction is a hexadecahedron, 16 triangular faces, 24 edges, and 10 vertices. Starting with the regular octahedron, it is elongated along one axes, adding 8 new triangles. It has 2 sets of 3 coplanar equilateral triangles (each forming a half-hexagon), and thus is not a Johnson solid.
Triaugmented triangular prismThe triaugmented triangular prism, in geometry, is a convex polyhedron with 14 equilateral triangles as its faces. It can be constructed from a triangular prism by attaching equilateral square pyramids to each of its three square faces. The same shape is also called the tetrakis triangular prism, tricapped trigonal prism, tetracaidecadeltahedron, or tetrakaidecadeltahedron; these last names mean a polyhedron with 14 triangular faces. It is an example of a deltahedron and of a Johnson solid.
