Supplementary Angles | | A ray that divides an angle into two adjacent angles that are congruent |

Ray | | Measure equal to 180* |

Conjecture | | Two lines that are coplanar and DO NOT intersect |

Segment | | Two lines that intersect to form a right angle |

Congruent Angles | | Angle with measure equal to 90* |

Straight Angle | | Two angles measure have the sum or 180* |

Plane | | Unproven Statement that is based on observation |

Parallel Lines | | Divides,or Bisects,a segment into two congruent segments |

Line | | If C is between A and B |

Obtuse Angle | | Two different rays that have the same initial point |

Midpoint | | It has no dimension, represented by a small dot |

Compementary Angles | | Angles that have the same measure |

Angle Bisector | | Part of a line that consists of two points |

Segment Bisector | | Part of a line that consists of a point called an inital point |

Angle | | Segments that have the same length |

Postulate | | An angle with measure between 0* and 90* |

Opposite Rays | | A line extends in one dimension it is usuall represented by a straight line with two arrowheads |

Linear Pair | | It is usually represented by a shape that looks like a table top or wall |

Point | | Two angles whose sides form two pairs of opposite rays |

Vertical Angles | | Measure of 90* and 180* |

Congruent Segments | | Two adjacent angles whose noncommon sides are opposite rays |

Acute Angle | | Rules that are accepted without proof |

Perpendicular Lines | | Two angles whose measure have the sum of 90* |

Righ Angle | | Ray,Line,or Plane that intersects a segment at its midpoint |