# Enneadecagon

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Enneadecagon | |
---|---|

Rank | 2 |

Type | Regular |

Space | Spherical |

Notation | |

Coxeter diagram | x19o |

Schläfli symbol | {19} |

Elements | |

Edges | 19 |

Vertices | 19 |

Vertex figure | Dyad, length 2cos(π/19) |

Measures (edge length 1) | |

Circumradius | |

Inradius | |

Area | |

Angle | |

Central density | 1 |

Number of pieces | 19 |

Level of complexity | 1 |

Related polytopes | |

Army | {19} |

Dual | Enneadecagon |

Conjugate | 8 total |

Abstract properties | |

Euler characteristic | 0 |

Topological properties | |

Orientable | Yes |

Properties | |

Symmetry | I_{2}(19), order 38 |

Convex | Yes |

Nature | Tame |

The **enneadecagon** is a polygon with 19 sides. A regular enneadecagon has equal sides and equal angles.

A circle with radius 3 centered at the center of an enneadecagon intersects its sides. This is related to the fact that 19/3 ≈ 2π.

## Stellations[edit | edit source]

- 2-enneadecagram
- 3-enneadecagram
- 4-enneadecagram
- 5-enneadecagram
- 6-enneadecagram
- 7-enneadecagram
- 8-enneadecagram
- 9-enneadecagram

## External links[edit | edit source]

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

- Wikipedia Contributors. "Enneadecagon".