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# Similarity

### Chapter 6 Vocabulary

Word | Definition |
---|---|

ratio | a comparispn of two numbers using division |

proportion | an equation that states that two ratios are equal |

extreme | the first and last terms of a proportion |

geommetric mean | for 2 positive numbers a and b, the positive number x that satifies a/x = x/b. so x(2)= ab and x= sqrt. of ab. |

scale drawing | a drawing that is the same shape as the object it represents |

scale | a ratio that describes how the demensions in a scale drawing are related to the actual demensions of the object |

similar polygons | two polygpns such that their corresponding angles are congruent and the lengths of the corresponding sides are proprotional |

scale factor of two similar polygons | the ratio of the lengths of two corresponding sides of two similar polygons |

dilation | a transformation that stretches of a shrinks a figure to create a similar figure |

center of dilation | in a dilation, the fixed point about which the figure in=s enlarged or reduced |

scale factor of a dilation | in a dilation the ratio of a side length of the image to the correponding side length of the original figure |

reduction | a dilation with a scale factor between 0 and 1 |

enlargement | a dilation with a scale factor greater than 1 |

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softballchick7309