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# Marcus Math Ch 7

### marcus math vocab

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

In the proportion a/b=c/d, where b is not equal to 0 and d is not equal to 0, the cross products are ad and bc. The proportion is true if and only if the cross products are equal. | cross products |

A transformation determined by a center point C and a scale factor k. When k>0, the image P prime of P is the point on ray CP such that CPprime=/k/*CP. When k<0, the image P prime of P is the point on the ray opposite ray CP such that CPprime=k*CP. | dilation |

An image that is larger then the original figure. | enlargement |

In a/b=c/d, the numbers a and d | extremes |

In a/b=c/d, the numbers b and c | means |

A segment with endpoints that are the midpoints of two sides of a triangle. | midsegment of a triangle |

An equation of the form a/b=c/d that states that two ratios are equal. | proportion |

A comparison of two quantities using division. | ratio |

An image that is smaller than the original figure. | reduction |

The ratio of a length on the model or drawing to the actual length of the object being modeled or drawn. | scale |

A drawing with lengths proportional to the object it represents. | scale drawing |

The ratio of the lengths of two corresponding sides of two similar polygons or two similar solids. | scale factor |

An object with lengths proportional to the object it represents. | scale model |

Polygons that have the same shape but not necessarily the same size. | similar polygons |

When a figure and its transformation image are similar. | similarity transformation |

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kmmspatriots