A | B |

Acute Angle | Measures greater than zero degrees and less than 90 degrees |

Right Angle | Equals 90 degrees |

Obtuse Angle | Measures greater than 90 degrees and less than 180 degrees |

Straight Angle | Equals 180 degrees |

Complementary Angles | Two angles for which the sum of their measures is 90 degrees |

Supplementary Angles | Two angles for which the sum of their measures is 180 degrees |

Adjacent Angles | Two angles that share a common side but do not overlap each other |

Vertical Angles | When two lines intersect, the angles that are not adjacent. They are always equal in measure |

Reflex Angle | Measures greater than 180 degrees and less that 360 degrees |