title: Heptagonal bipyramid
text: # Heptagonal bipyramid
  
  The heptagonal bipyramid is one of the infinite set of bipyramids, dual to the infinite prisms. If an heptagonal bipyramid is to be face-transitive, all faces must be isosceles triangles. The resulting solid has 14 triangular faces, 9 vertices and 21 edges.
  
  ## Related polyhedra
  
  "Regular" right (symmetric) n-gonal bipyramids: :
  
  | Bipyramid name | Digonal bipyramid | Triangular bipyramid (See: $J_{12})$ | Square bipyramid (See: O) | Pentagonal bipyramid (See: $J_{13})$ | Hexagonal bipyramid | Heptagonal bipyramid | Octagonal bipyramid | Enneagonal bipyramid | Decagonal bipyramid | ... | Apeirogonal bipyramid |
  | - | - | - | - | - | - | - | - | - | - | - | - |
  | Polyhedron image | | | | | | | | | | ... | |
  | Spherical tiling image | | | | | | | | | | Plane tiling image | |
  | Face config. | V2.4.4 | V3.4.4 | V4.4.4 | V5.4.4 | V6.4.4 | V7.4.4 | V8.4.4 | V9.4.4 | V10.4.4 | ... | V∞.4.4 |
  | Coxeter diagram | | | | | | | | | | ... | |
  