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# ch 6 math

### math ch 6 vocab... postulates... theorems

Question | Answer |
---|---|

ratio | a comparison of two numbers using division |

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

means | in a/b=c/d, a and c are means |

extremes | in a/b=c/d, a and d are extremes |

geometric mean | two positive numbers a and b is the positive number x that satisfies a/x = x/b. So, x squared = ab and x = √ab. |

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

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

similar polygons | two polygons are similar if corresponding angles are congruent and corresponding side lengths are proportional. |

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

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

center of dilation | in a dilation, a figure is enlarged or reduces with the respect to a fixed point |

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

reduction | if 0<k<1, the dilation of a reduction. |

enlargement | if k>1, the dilation is an enlargement. |

Created by:
the cat