In geometry , a
pentahedron (plural: pentahedra) is a polyhedron with five faces. Since there are no face-transitive polyhedra with five
Kaynak: PentahedronSylvester
pentahedron : Sylvester showed that a generic quaternary cubic can be written as a sum of 5 cubes of linear forms, unique up to
Kaynak: Quaternary cubicEquivalently, it is a
pentahedron of which two faces are parallel, while the surface normal s of the other three are in the same plane
Kaynak: Triangular prismIt is well known for its distinctive prism shape (triangular prism or
pentahedron ). History: File:Toblerone Bars. jpg | Toblerone File:
Kaynak: TobleroneThe naming system is again based on Classical Greek, for example tetrahedron (4),
pentahedron (5), hexahedron (6), heptahedron (7),
Kaynak: PolyhedronSolids (4 and 10-node tetrahedron s, 6-node
pentahedron s, and 8-node hexahedron s) (with over 20 solid element formulations)
Kaynak: LS-DYNAToeplitz invariant An invariant of nets of quadrics in 3-dimensional projective space that vanishes on nets with a common polar
pentahedron.
Kaynak: Glossary of invariant theory