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# Geometry - Act 13

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

Triangle Sum Theorem | The sum of the measures of angles in a triangle is 180 degrees |

auxiliary line | when you add a line to a figure you are given for a proof |

interior angle | angle formed by two sides of a triangle |

exterior angle | angle formed by one side of a triangle and the extension of an adjacent side |

remote interior angle | an interior angle that is not adjacent to a given exterior angle |

Exterior Angle Theorem | The measure of an exterior angle is equal to the sum of the measures of its two remote interior angles. |

Isosceles Triangle Theorem | The sum of the base angles are congruent |

When two parallel lines are cut by a transversal, thealternate interior angles are | congruent |

When two parallel lines are cut by a transversal, the same-side interior angles are | supplementary |

When two parallel lines are cut by a transversal, the corresponding angles are | congruent |

Isosceles Triangle | A triangle with at least two congruent sides. |

coincide | correspond exactly |

vertex angle | the angle included by the legs of isosceles triangle |

base angle | the angle included by one leg and the base of an isosceles triangle |

leg | one of the equal sides of an isosceles triangle |

base | the non-congruent side of an isosceles triangle |

altitude | segment from a vertex perpendicular to the opposite side |

median of triangle | segment from a vertex to the midpoint of the opposite side |

Created by:
shoemaker