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# Howard Geometry 1

### Chapter 1 Geometry Vocabulary

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

vertex | point where two angle's sides meet |

plane | a two dimension that extends in four directions; it can be defined with three non-collinear points |

transformation | the operation, or set of instructions, that maps a figure onto an image |

collinear points | points on the same line |

angle | two rays that share the same endpoint |

ray | a part of a line that has a beginning but no end |

acute angle | an angle that has a measure between 0 and 90 degrees |

endpoint | the point where a ray begins |

intersection | the point or points that two figures have in common |

translation | a slide that preserves both size and shape |

coplanar points | points on the same plane |

undefined terms | mathematical terms that cannot be defined mathematically defined using other known words |

obtuse angle | an angle that has a measure between 90 and 180 degrees |

rotation | a transformation in which a figure is turned about a fixed point |

line | a figure named by two points that extends forever in 2 directions |

congruent segments | segments that have exactly the same length |

image | the new figure after the transformation has taken place |

reflection | a transformation in which a figure is flipped about a given line or axis |

coordinate | the x or y component of a point |

degrees | the units that a protractor measures an angle |

segment | a part of a line that has both a beginning and an end |

coplanar lines | lines that are on the same plane |

right angle | an angle whose measure is exactly 90 degrees |

straight angle | an angle whose measure is exactly 180 degrees |