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# Geometry - Angles

### Complementary, supplementary, vertical, adjacent, congruent, triangles

Term | Definition |
---|---|

Supplementary Angles | Two angles that have a sum of 180º (they add up to 180º) |

Complementary Angles | Two angles that have a sum of 90º (they add up to 90º) |

Vertical Angles | Two angles that are opposite and equal, formed when two lines intersect |

Adjacent Angles | Two angles that share a common vertex and a common ray (two angles that are right next to each other) |

Congruent Angles | Angles that are equal |

Parallel Lines | Two lines that never cross |

Transversal | A line that cuts between two parallel lines |

The sum of the angles in a triangle is... | 180º |

Exterior Angles of a Triangle | Angles outside the triangle that make a supplementary pair (180). It is also equal to the sum of the other two interior angles. |

What do supplementary angles add up to? | 180º |

What do complementary angles add up to? | 90º |

How do you set up an equation to find a missing angle with supplementary angles? | Add the two angles together and set it equal to 180º |

How do you set up an equation to find a missing angle with complementary angles? | Add the two angles together and set it equal to 90º |

How do you set up an equation to find a missing angle with vertical angles? | Set the two angles equal to each other |

How can you tell if two angles are supplementary from a picture? | They form a straight line |

How can you tell if two angles are complementary rom a picture? | They form a right angle (look for the box in the corner) |

How can you tell if two angles are vertical from a picture? | They are opposite each other |

How do you set up an equation to find the missing angle of a triangle? | Add all three angles together and set it equal to 180º |