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# Angles and Triangles

Term | Definition |
---|---|

vertex | the point where two rays meet |

right angle | an angle that measures exactly 90 degrees |

acute angle | an angle that measures less than 90 degrees |

obtuse angle | an angle that measures greater than 90 degrees |

straight angle | an angle that measures exactly 180 degrees |

vertical angles | opposite angles formed by the intersection of two lines |

congruent | having the same measure |

adjacent angles | angles that have the same vertex, share a common side, and do not overlap |

complementary angles | two angles whose measures add up to 90 degrees |

supplementary angles | two angles whose measures add up to 180 degrees |

triangle | a geometric figure with three sides and three angles |

acute triangle | a triangle whose angles all measure less than 90 degrees |

right triangle | a triangle with one 90 degree angle |

obtuse triangle | a triangle with one angle measuring greater than 90 degrees |

scalene triangle | a triangle with no congruent sides |

isosceles triangle | a triangle with at least two congruent sides |

equilateral triangle | a triangle with three congruent sides |

congruent segments | sides with the same length |

Created by:
Mrs. Hancock