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# Ch.4 App.Proportions

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

congruent angles | angles that have the same measure |

conversion factor | rates equal to 1 |

cross products | two ratios are found by multiplying the denominator of one ratio by the numerator of the other ratio |

dilation | is a transformation where the original figure and its image are similar |

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

indirect measurement | uses proportions and similar triangles to measure distances that would be difficult to measure directly |

proportion | is an equation stating that two ratios are equal |

rate | is a ratio that compares two quantities measured in different units |

reduction | a dilation with a scale factor less than 1 |

scale | is the ratio that compares a length in a drawing to the corresponding length in the actual object |

scale factor | the ratio of the dimensions of the image to the dimensions of the original figure |

scale model | is an enlarged or reduced model of an object that is similar to the actual object |

similar figures | have the same shape but not necessarily the same size |

similar polygons | if the corresponding angles of two polygons have the same measure and the lengths of their corresponding sides are proportional |

unit rate | the rate for one unit of a given quantity |

Created by:
cpasteris