Meaning | A three-sided polygon. |
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Synonyms | triangle, trigon |
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Narrower | acute triangle, acute-angled triangle | A triangle whose interior angles are all acute |
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equilateral triangle, equiangular triangle | A three-sided regular polygon |

isosceles triangle | A triangle with two equal sides |

oblique triangle | A triangle that contains no right angle |

obtuse triangle, obtuse-angled triangle | A triangle that contains an obtuse interior angle |

right triangle, right-angled triangle | A triangle with one right angle |

scalene triangle | A triangle with no two sides of equal length |

wedge, wedge shape, cuneus | Any shape that is triangular in cross section |

Broader | polygon, polygonal shape | A closed plane figure bounded by straight sides |
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Spanish | triángulo, trilateral |
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Catalan | triangle, trilateral |
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