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A Johnson solid is a convex polyhedron whose faces are all regular polygons. [1] Here, a polyhedron is said to be convex if the shortest path between any two of its vertices lies either within its interior or on its boundary, none of its faces are coplanar (meaning they do not share the same plane, and do not "lie flat"), and none of its edges are colinear (meaning they are not segments of the ...
The Johnson solids are named after American mathematician Norman Johnson (1930–2017), who published a list of 92 such polyhedra in 1966. His conjecture that the list was complete and no other examples existed was proven by Russian-Israeli mathematician Victor Zalgaller (1920–2020) in 1969.
In geometry, the tridiminished rhombicosidodecahedron is one of the Johnson solids (J 83). It can be constructed as a rhombicosidodecahedron with three pentagonal cupolae removed. 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 ...
In mathematics, a Johnson solid is a type of convex polyhedron. For more information, see Johnson solid . Wikimedia Commons has media related to Johnson solids .
3D model of an elongated pentagonal pyramid. In geometry, the elongated pentagonal pyramid is one of the Johnson solids (J 9).As the name suggests, it can be constructed by elongating a pentagonal pyramid (J 2) by attaching a pentagonal prism to its base.
In geometry, the metabidiminished rhombicosidodecahedron is one of the Johnson solids (J 81). 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 ...
In geometry, the triangular hebesphenorotunda is a Johnson solid with 13 equilateral triangles, 3 squares, 3 regular pentagons, and 1 regular hexagon, making the total of its faces is 20. Properties [ edit ]
In geometry, the triangular orthobicupola is one of the Johnson solids (J 27). As the name suggests, it can be constructed by attaching two triangular cupolas (J 3) along their bases. It has an equal number of squares and triangles at each vertex; however, it is not vertex-transitive.