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# Chapter 6 - Geo.

### Chapter 6 Vocabulary - Similarity

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

center of dilation | in dilation, the fixed point about which the figure is enlarged or reduced |

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

enlargement | a dilation with a scale factor larger than one |

extremes of a proportion | the first and last terms of a proportion |

geometric mean | for two positive numbers a and b, the positive number x that satisfies a/x = x/b; so x squared = ab and x = the square foot of ab |

means of a proportion | the middle terms of a proportion |

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

ratio of a to b | a comparison of two numbers using division; the ratio of a to b, where be does not equal 0, can be written as a to b, as a:b, or as a/b |

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

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

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

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

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

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

Created by:
kgatling