Heptagonal prism
Type	Uniform polyhedron
Faces	2 Heptagons 7 squares
Edges	21
Vertices	14
Vertex configuration	7.4.4
Wythoff symbol	2 7 | 2
Coxeter diagram
Symmetry group	D7h, [7,2], (*722), order 28
Rotation group	D7, [7,2]+, (722), order 14
Dual polyhedron	Heptagonal bipyramid
Properties	Convex semiregular
Vertex figure

In geometry, the heptagonal prism is a prism with heptagonal base. This polyhedron has 9 faces (2 bases and 7 sides), 21 edges, and 14 vertices.^[1][2]

The area of a right heptagonal prism with height ${\displaystyle h}$ and with a side length of ${\displaystyle L}$ and apothem ${\displaystyle a_{p}}$ is given by:^[1]

${\displaystyle A=7L\cdot (a_{p}+h)}$

The volume is found by taking the area of the base, with a side length of ${\displaystyle L}$ and apothem ${\displaystyle a_{p}}$, and multiplying it by the height ${\displaystyle h}$, giving the formula:^[1]

${\displaystyle V={\frac {7}{2}}\cdot h\cdot L\cdot a_{p}}$

This formula also works for the oblique prism due to the Cavalieri's principle.

The heptagonal prism can also be seen as a tiling on a sphere:

Family of uniform n-gonal prisms v t e
Prism name	Digonal prism	(Trigonal) Triangular prism	(Tetragonal) Square prism	Pentagonal prism	Hexagonal prism	Heptagonal prism	Octagonal prism	Enneagonal prism	Decagonal prism	Hendecagonal prism	Dodecagonal prism	...	Apeirogonal prism
Polyhedron image												...
Spherical tiling image												Plane tiling image
Vertex config.	2.4.4	3.4.4	4.4.4	5.4.4	6.4.4	7.4.4	8.4.4	9.4.4	10.4.4	11.4.4	12.4.4	...	∞.4.4
Coxeter diagram												...

• Weisstein, Eric W. "Prism". MathWorld.

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