In geometry, a pentahedron (pl.: pentahedra) is a polyhedron with five faces or sides. There are no face-transitive polyhedra with five sides and there...

the 5 planes where these 5 linear forms vanish is called the Sylvester pentahedron. Ternary cubic Ternary quartic Invariants of a binary form Clebsch, A...

trireme e.g. triathlon, Tripolis e.g. Triton/ium e.g. tetrahedron e.g. pentahedron e.g. hexahedron e.g. September e.g. heptathlon e.g. hebdomas e.g. October...

ephedra, exedra, hemipolyhedron, hexahedron, octahedron, pentahedroid, pentahedron, polyhedron, pyritohedron, rhombohedron, sanhedrin, synedrion, tetrahedroid...

principle Invariant of a binary form Sylvester's construction Sylvester pentahedron Sylvester's problem Umbral calculus List of things named after James...

faces. For example a tetrahedron is a polyhedron with four faces, a pentahedron is a polyhedron with five faces, a hexahedron is a polyhedron with six...

the city. Early books include Sole Glum Trek (1967), Watches (1969), Pentahedron (1972) and The Poems of Sweeny Peregrine: A Working of the Corrupt Irish...

hemi-octahedron, hemi-dodecahedron, hemi-icosahedron Tetrahedron Disphenoid Pentahedron Square pyramid, Triangular prism Hexahedron Parallelepiped, Cuboid, Rhombohedron...

elongated rectangle, the corners of which are adjoined by two five-sided pentahedron towers. On the south side of the central block, opposite the park, is...

ephedra, exedra, hemipolyhedron, hexahedron, octahedron, pentahedroid, pentahedron, polyhedron, pyritohedron, rhombohedron, sanhedrin, synedrion, tetrahedroid...