Tetradecagram

Tetradecagram
(OFF file)
Rank	2
Type	Regular
Space	Spherical
Notation
Bowers style acronym	Tedag
Coxeter diagram	x14/3o
Schläfli symbol	{14/3}
Elements
Edges	14
Vertices	14
Vertex figure	Dyad, length 2cos(3π/14)
Measures (edge length 1)
Circumradius	$\frac{1}{2\sin\frac{3\pi}{14}} ≈ 0.80194$
Inradius	$\frac{1}{2\tan\frac{3\pi}{14}} ≈ 0.62698$
Area	$\frac{7}{2\tan\frac{3\pi}{14}} ≈ 4.38886$
Angle	$\frac{4\pi}{7} ≈ 102.85714^\circ$
Central density	3
Number of external pieces	28
Level of complexity	2
Related polytopes
Army	Ted, edge length $\frac{1}{1+2\cos\frac\pi7}$
Dual	Tetradecagram
Conjugates	Tetradecagon, Great tetradecagram
Convex core	Tetradecagon
Abstract & topological properties
Flag count	28
Euler characteristic	0
Orientable	Yes
Properties
Symmetry	I2(14), order 28
Convex	No
Nature	Tame

The tetradecagram, or tedag, is a non-convex polygon with 14 sides. It's created by taking the second stellation of a tetradecagon. A regular tetradecagram has equal sides and equal angles.

It is one of two regular 14-sided star polygons, the other being the great tetradecagram.

It is the uniform truncation of the great heptagram.

External links

• Bowers, Jonathan. "Regular Polygons and Other Two Dimensional Shapes".

• Wikipedia Contributors. "Tetradecagram".