# Equilateral triangle

## Shape with three equal sides / From Wikipedia, the free encyclopedia

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"Equilateral" redirects here. For other uses, see Equilateral (disambiguation).

In geometry, an **equilateral triangle** is a triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. It is also a regular polygon, so it is also referred to as a **regular triangle**.

**Quick Facts**Type, Edges and vertices ...

Equilateral triangle | |
---|---|

Type | Regular polygon |

Edges and vertices | 3 |

Schläfli symbol | {3} |

Coxeter–Dynkin diagrams | |

Symmetry group | D_{3} |

Area | ${\tfrac {\sqrt {3}}{4}}a^{2}$ |

Internal angle (degrees) | 60° |

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