linear pair | | consists of a point and all points on the line that extend in one direction |

angle bisector | | extends in one dimension |

right angle | | an angle with a measure between 90 and 180 degrees |

Plane | | an angle with a measure less than 90 degrees |

parallel lines | | rules that are accepted without proof |

straight angle | | an unrpoven statement that is based on observation |

point | | extends in 2 dimensions |

conjecture | | a ray that divides an angle into 2 adjacent angles that are congruent |

segment bisector | | a 90 degree angle |

Line | | the point that divides a segment into 2 congruent segments |

segment | | 2 lines that intersect to form a right angle |

Ray | | a small dot with no dimension |

Postulate | | 2 different rays that have the same point |

Angle | | 2 angles whose sides form 2 pairs of opposite rays |

midpoint | | 2 adjacent angles whose noncommon sides are opposite rays |

vertical angles | | and angle witha measure of 180 degrees |

congruent angles | | 2 angles whose measure have the sume of 180 degrees |

perpendiculer lines | | part of line that consists of 2 points and all points between the endpoints |

congruent segments | | if C is between A and B, the CA and CB are opposite rays |

supplementary angles | | a segment, ray, line, or plane that intersects a segment at its midpoint |

Acute angle | | angles that have the same measure |

opposite rays | | segments that have the same length |

obtuse angle | | 2 lines that never intersect |

complementary angles | | 2 angles whose measure have the sum of 90 degrees |