# Tridecagram

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Tridecagram | |
---|---|

Rank | 2 |

Type | Regular |

Notation | |

Bowers style acronym | Trad |

Coxeter diagram | x13/3o () |

Schläfli symbol | {13/3} |

Elements | |

Edges | 13 |

Vertices | 13 |

Vertex figure | Dyad, length 2cos(3π/13) |

Measures (edge length 1) | |

Circumradius | |

Inradius | |

Area | |

Angle | |

Central density | 3 |

Number of external pieces | 26 |

Level of complexity | 2 |

Related polytopes | |

Army | Tad, edge length |

Dual | Tridecagram |

Conjugates | Tridecagon, Small tridecagram, Medial tridecagram, Great tridecagram, Grand tridecagram |

Convex core | Tridecagon |

Abstract & topological properties | |

Flag count | 26 |

Euler characteristic | 0 |

Schläfli type | {13} |

Orientable | Yes |

Properties | |

Symmetry | I_{2}(13), order 26 |

Flag orbits | 1 |

Convex | No |

Nature | Tame |

The **tridecagram** is a non-convex polygon with 13 sides. It is the second stellation of a tridecagon. A regular tridecagram has equal sides and equal angles.

It is one of five regular 13-sided star polygons, the other four being the small tridecagram, the medial tridecagram, the great tridecagram, and the grand tridecagram.

## External links[edit | edit source]

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

- Wikipedia contributors. "Tridecagram".