Heptahedron

A diminished cube, realized with 4 equilateral-triangle and 3 kite faces, all having the same area,[1]

A heptahedron (pl.: heptahedra) is a polyhedron having seven sides, or faces.

A heptahedron can take a large number of different basic forms, or topologies. The most familiar are the hexagonal pyramid and the pentagonal prism. Also notable is the tetrahemihexahedron, which can be seen as a tessellation of the real projective plane. No heptahedra are regular.

  1. ^ Frank Chester. "The Geometry of the Chestahedron". Retrieved 8 August 2022.