A | B |

angle | two rays that share a common endpoint(vertex) |

protractor | tool used to measure angles |

acute angle | angle that measures less than 90 degrees |

right angle | angle that measures 90 degrees |

obtuse angle | angles that measures more than 90 but less than 180 degrees |

straight angle | measures 180 degrees |

adjacent angle | angles that share a vertex and a side |

complementary angles | the sum of the measures of 2 angles is 90 degrees |

supplementary angles | the sum of the measures of two angles is 180 degrees |

scalene triangle | a triangle with no congruent sidess |

isosceles triangle | a triangle with two congruent sides |

equilateral triangle | a triangle with three congruent sides |

right triangle | a triangle with one right angle |

acute triangle | a triangle with 3 acute angles |

obtuse triangle | a triangle with one obtuse angle |

triangle | a polygon with 3 sides |