# Dodecagram

Dodecagram
Rank2
TypeRegular
Notation
Bowers style acronymDodag
Coxeter diagramx12/5o ()
Schläfli symbol{12/5}
Elements
Edges12
Vertices12
Measures (edge length 1)
Circumradius${\displaystyle {\frac {{\sqrt {6}}-{\sqrt {2}}}{2}}\approx 0.51764}$
Inradius${\displaystyle {\frac {2-{\sqrt {3}}}{2}}\approx 0.13397}$
Area${\displaystyle 3(2-{\sqrt {3}})\approx 0.80385}$
Angle30°
Central density5
Number of external pieces24
Level of complexity2
Related polytopes
ArmyDog, edge length ${\displaystyle 2-{\sqrt {3}}}$
DualDodecagram
ConjugateDodecagon
Convex coreDodecagon
Abstract & topological properties
Flag count24
Euler characteristic0
OrientableYes
Properties
SymmetryI2(12), order 24
ConvexNo
NatureTame

The dodecagram is a star polygon with 12 sides. A regular dodecagram has equal sides and equal angles.

This is the fourth stellation of the dodecagon, and the only one that is not a compound. The only other polygons with a single non-compound stellation are the pentagon, the octagon, and the decagon.

It is the uniform quasitruncation of the hexagon, and as such appears as faces in a handful of uniform Euclidean tilings. It is the largest star polygon known to appear in any non-prismatic spherical or Euclidean uniform polytopes.

## Vertex coordinates

Coordinates for a dodecagram of unit edge length, centered at the origin, are all permutations of:

• ${\displaystyle \left(\pm {\frac {{\sqrt {3}}-1}{2}},\,\pm {\frac {{\sqrt {3}}-1}{2}}\right),}$
• ${\displaystyle \left(\pm {\frac {1}{2}},\,\pm {\frac {2-{\sqrt {3}}}{2}}\right).}$

## Representations

A dodecagram has the following Coxeter diagrams:

• x12/5o (full symmetry)
• x6/5x () (G2 symmetry)