A | B |

line | a straight path that goes on forever in both directions |

ray | part of a line having only one endpoint |

angle | two rays having the same endpoint |

paralllel lines | lines that never cross even if they are extended |

intersecting lines | lines that cross each other at a point |

perpendicular lines | lines that form square corners where they cross |

endpoint | a point at the end of a ray |

vertex | the pont that two rays of an angle have in common |