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# Geo. Vocab Unit 1

### vocabulary for unit one of eighth grade geometry

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

directed line segment | A line segment with an initial endpoint and a terminal endpoint. |

fractional distance | An intermediary point some fraction of the length of a line segment. |

point | A location with no size, only position. |

line | A line is made up of points, has no thickness or width, and extends indefinitely in both directions. |

plane | A flat surface made up of points that has no depth and extends indefinitely in all directions. |

space | A boundless three-dimensional set of all points. |

intersection | A set of points common to two or more geometric figures. |

undefined terms | Words that are not formally explained by means of more basic words and concepts. |

postulate | A statement that is accepted as true without proof. |

theorem | A statement that can be proven true using undefined terms, definitions, and postulates. |

synthetic geometry | The study of geometric figures without the use of coordinates. |

analytic geometry | The study of geometry that uses the coordinate system. |

midpoint | The point on a line segment halfway between the endpoints of the segment. |

equidistant | A point is equidistant from other points if it is the same distance from them. |

bisect | Separate a line segment into two congruent segments. |

segment bisector | Any segment, line, plane, or point that intersects a line segment at its midpoint. |

distance | The length of the line segment between two points. |

line segment | A measurable part of a line that consists of two points, called endpoints, and all of the points between them. |

betweenness of points | Point C is between A and B if and only if A, B, and C are collinear and AC + CB = AB |

congruent | Two figures are congruent if one can be obtained from the other by a sequence of rotations, reflections, and translations. |

congruent segments | Line segments that are the same length. |

constructions | Methods of creating figures without the use of measuring tools. |