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# Proof Vocab

### Geometry

Question | Answer |
---|---|

A midpoint divides a line segment into ______________ ________ _________. | Two congruent parts. |

A bisector divides a line segment into ___________ __________ ________. | Two congruent parts. |

A bisector divides an angle into ____________ __________ ____________. | Two congruent angles. |

If two angles form a right angle, then they are _____________. | Complementary. |

If two angles form a linear pair, then they are ____________. | Supplementary. |

Interesting lines form __________ ___________. | Vertical angles. |

Vertical angles are ____________. | Congruent. |

An altitude in a triangle is _______________ to the side it intersects. | Perpendicular. |

Perpendicular lines form ________ ___________. | Right angles. |

All right angles are ______________. | Congruent. |

A median in a triangle __________ the side it intersects. | Bisects. |

Supplements of congruent angles are ____________. | Congruent. |

Complements of congruent angles are ______________. | Congruent. |

In a triangle, the measure of an exterior angle is equal to the sum of the measures of _________ ___________ ___________. | Remote interior angles. |

If two sides of a triangle are congruent, then the angles opposite them are ________________. | Congruent. |

If two angles of a triangle are congruent, then the sides opposite them are _____________. | Congruent. |

If two parallel lines are cut by a transversal, then corresponding are __________. | Congruent. |

If two parallel line are cut by a transversal, then alternate interior angles are ______________. | Congruent. |

If two parallel lines are cut by a transversal, then alternate exterior angles are _____________. | Congruent. |

If two lines are cut by a transversal and the alternate interior angles are congruent, then the lines are ___________________. | Parallel. |

If two lines are cut by a transversal and the alternate exterior angles are congruent, then the lines are _____________. | Parallel. |

If two lines are cut by a transversal and the corresponding angles are congruent, then the lines are _______________. | Parallel. |

If two lines are cut by a transversal and the same side interior angles are supplementary, then the lines are ______________. | Parallel. |

If a triangle has two congruent sides, it is _______________. | Isosceles. |

If a triangle has two congruent angles, then it is _____________. | Isosceles. |

If a triangle is isosceles, then the base angles are ______________. | Congruent. |

If a triangle is isosceles, then the legs are _____________. | Congruent. |

AB=AB. | Reflexive property. |

If AB=BC and BC=EF, then AB=EF. | Transitive property. |

If OA=AB, then AB=OA. | Symmetric property. |

If AB=DF and BC = CD, then AB-BC=DF-CD. | Subtraction property. |

If AB=DF and BC=CD, then AB + BC= DF + CD. | Addition property. |

DE + CD = CE and CD= AB, then DE + AB = CE. | Substitution property. |

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emarciante9