A | B |

space | the set of all possible points |

line segment | a part of a line with a beginning point and an end point |

ray | part of a line with a beginning point but no end point |

opposit rays | 2 rays with a common endpoint that form a line |

collinear | points on the same liine |

coplanar | points and or lines on the same plane |

angle | union of 2 rays with a common endpoint |

adjacent angles | andgles with a common endpoint and common side but no interior points in common (side by side) |

congruent | items that have the same measure |

midpoint | of a segment is a point that divides segments into 2 congruent parts |

segment bisector | a ray line or segment that goes through the midpoint |

angle bisector | a ray that divides angles into 2 congruent angles |

perpendicular lines | 2 lines that intersect @ a right angle |

postulate | statement that we accept as true without proof |