A | B |

Acute | more than zero degrees and less than 90 degrees |

Obtuse | more than 90 degrees and less than 180 degrees |

Right | 90 degrees |

Parallel | two or more lines in the same plane that are the same distance apart and will never intersect |

Perpendicular | two lines, segments, or rays that meet and form a 90 degree angle |

Supplementary angles | angles whose sum is equal to 180 degrees |

Complementary angles | ansgles whose sum is equal to 90 degrees |

Linear Pair | two or more angles that meet and creat a line |

Pentagon | polygon with 5 sides |

Hexagon | polygon with 6 sides |

Octagon | polygon with 8 sides |

Decagon | polygon with 10 sides |

convex | polygon with all diagonals inside the polygon |

concave | polygon with at least one diagonal outside the polygon |