A | B |

Straight Angle | angle whose measure is 180 |

Perpendicular | two lines which intersect to form right angles |

Interior Angles | angles formed by two lines and a transversal and are located between the lines |

Vertical Angles | angles formed by two intersecting lines, but are not a linear pair |

Obtuse Angle | an angle whose measure is between 90 and 180 |

Opposite Rays | two rays that share the same endpoint and together form a line |

Supplementary Angles | two angles whose measure add up to 180 |

Corresponding Angles | any pair of angles in similar locations in relation to a transversl intersecting two lines |

Linear Pair | a pair of angles that have a common side and their non-common sides are opposite rays |

Alternate Interior Angles | angles formed by two lines and a transversal that are between the two lines and on opposite sides of the transversal |

Acute Angle | an angle whose measure is between 0 and 90 |

Right Angle | an angle whose measure is 90 |

Parallel Lines | two lines in a plane that have no points in common |

Transversal | a line that intersects two or more lines |

Exterior Angles | angles formed by two lines and a transversal that are not between the two lines |