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# Unit 4 Vocab

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

angle | The union of two rays with a common endpoint |

ray | A part of a line consisting of an endpoint and all points on one side of that endpoint |

complementary angles | Two angles that have a sum of 90 degrees |

supplementary angles | Two angles that have a sum of 180 degrees |

congruent | Having the same shape and size |

transversal | A line that intersects two or more lines at different points |

alternate exterior angles | Angles that are outside the parallels and on opposite sides of the transversal |

alternate interior angles | Angles that are inside the parallels and on opposite sides of the transversal |

corresponding angles | Angles that are in the same (relative) spot |

vertical angles | A pair of angles formed by two intersecting lines |

exterior angle of a triangle | The angle formed by extending a side of a triangle |

remote interior angle | The nonadjacent angles across from an exterior angle of a triangle |

transformation | A change in the position or size of a figure on a plane |

preimage | The original image in a transformation |

image | The position of a figure after a transformation |

translation | A transformation that slides each point of a figure the same distance in the same direction |

reflection | A transformation in which a figure is flipped over a line of reflection |

rotation | A transformation in which each point of the pre-image turns around the center of rotation |

similar figures | Figures in which the lengths of the corresponding sides are proportional and corresponding angles are congruent |

proportion | An equation stating that two ratios are equal |

scale factor | The ratio of the lengths of any pair of corresponding sides or edges in similar figures |

dilation | Transforming a figure bigger or smaller |

hypotenuse | The side of a right triangle that is opposite the right angle |

legs | In a right triangle, the sides that form the right angle |

Pythagorean Theorem | a^2 + b^2 = c^2 |

surface area | The sum of the areas of the faces of a 3d figure |

lateral area | The sum of the areas of the lateral (side) face of a 3d figure |