Elongated triangular pyramid
In geometry, the elongated triangular pyramid is one of the Johnson solids (J7). As the name suggests, it can be constructed by elongating a tetrahedron by attaching a triangular prism to its base. Like any elongated pyramid, the resulting solid is topologically (but not geometrically) self-dual.
| Elongated triangular pyramid | |
|---|---|
| Type | Johnson J6 – J7 – J8 |
| Faces | 1+3 triangles 3 squares |
| Edges | 12 |
| Vertices | 7 |
| Vertex configuration | 1(33) 3(3.42) 3(32.42) |
| Symmetry group | C3v, [3], (*33) |
| Rotation group | C3, [3]+, (33) |
| Dual polyhedron | self |
| Properties | convex |
| Net | |
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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.