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# Geometry Vocab Quiz

### Flashcards for the basic geometry vocabulary

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

What is a postulate? | A statement of fact |

What is another name for a postulate? | An axiom |

What is collinear? | Points that lie on the same line |

How many points do there need to be to be collinear? | Three or more |

What is non-collinear? | Points that do not lie on the same line |

How many points do there need to be to be non-collinear? | Three or more |

What is coplanar? | Three or more points/ lines that lie on the same plane |

What is non-coplanar? | Three or more points/ lines that do not lie on the same plane |

What are the three undefined terms? | Point, line, and plane |

What is a ray? | Part of a line that consists of one end point and all the points of the line on one side of the endpoint |

What are opposite rays? | Two rays that share the same end point and form a straight line |

What is a segment? | Part of a line that consists of two end points and all points between them |

What is the ruler postulate? | The distance between any two points is the absolute value of the difference of the corresponding numbers |

What is the segment addition postulate? | If three points A, B, and C are collinear and B is between A and C, then AB + BC = AC |

What is a midpoint? | A point that divides a segment into two congruent segments; bisects a segment; cuts in half |

What are congruent segments? | Same size, similar shape, equal measures, mark with a tick mark to show congruence |

What is an acute angle? | Angles between 0 and 90 degrees |

What is an obtuse angle? | Angles between 90 and 180 degrees |

What is a right angle? | Angles that are 90 degrees |

What is a straight angle? | Angles that are 180 degrees, or a straight line |

What are adjacent angles? | Two angles that are side by side and share a side and vertex |

What are vertical angles? | Two angles that are always congruent because their sides form two pairs of opposite rays |

What is a linear pair? | A pair of adjacent angles forming a straight line |

What does it mean to be complimentary? | The two angles add up to 90 degrees |

What does it mean to be supplementary? | The two angles add up to be 180 degrees |

What is the theorem? | All right angles are congruent and two angles that are supplementary and congruent are both right angles |

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alexprice