# T-tetromino

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T-tetromino | |
---|---|

Rank | 2 |

Type | Tetromino |

Elements | |

Edges | 1+1+2+2+2 |

Vertices | 2+2+2+2 |

Measures (minor edge length = 1) | |

Area | 4 |

Perimeter | 10 |

Abstract & topological properties | |

Flag count | 16 |

Euler characteristic | 0 |

Orientable | Yes |

Properties | |

Symmetry | A_{1}×I, order 2 |

Flag orbits | 8 |

Convex | No |

Net count | 4 |

The **T-tetromino** is a polyomino made of four squares (a tetromino).

It may be considered as an 8-sided figure with a single length 3 side, or as a 10-sided figure with colinear edges. The latter is most common when considering tessellations involving the T-tetromino as it makes it equilateral.

## Related polytopes[edit | edit source]

The prism of the T-tetromino is the T-tetracube. It has two T-tetromino faces, and is the only tetracube with T-tetromino faces.

The T-tetromino is the smallest of a general class of polyominos, the T-polyominos. The other members of this family can be formed by extending the central leg with additional squares while maintaining reflection symmetry.

## External links[edit | edit source]

- Weisstein, Eric W. "T-Polyomino" at MathWorld.

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