Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# Geometry 3 Theorems

### Chapter 3 Theorems

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

If two parallel lines are cut by a third plane | Then the lines of intersection are parallel |

If two parallel lines are cut by a transversal and alternate interior angles are formed | Then they are congruent |

If two parallel lines are cut by a transversal and same side interior angles are formed | Then they are supplementary |

If a transversal is perpendicular to one of two parallel lines | Then it is perpendicular to the other one also |

If two lines are cut by a transversal and alternate interior angles are congruent or if same side interior angles are supplementary | Then the lines are parallel |

If two lines are perpendicular to the same line in a plane | Then the perpendicular lines are parallel |

Through a point outside a line | There is exactly one line parallel to and perpendicular to the given line |

If two lines are parallel to a third line | Then the lines are parallel to each other |

The sum of the angles of a triangle | 180 |

The measure of an exterior angle of a triangle | Equals the sum of the measures of the two remote interior angles |

The sum of the measures of the angles of a convex polygon | (n-2)180 |

The sum of the measures of the exterior angles of any convex polygon | 360 |

Created by:
BucsBucs