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# Chaper 6 Geometry

### 8th Grade - 1/27/11

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

Cross Products Property | Multiplying the means, then the extremes, and setting them equal to solve for a variable. |

Ratio | a comparison of 2 numbers by division Represented by- a:b , a/b , or a to b |

Proportion | 2 ratios set equal |

Geometric Mean | A/X = X/B |

Reciprocal Property | If A/B = C/D , then B/A = D/C |

Interchanging Means Property | If A/B = C/D , then A/C = B/D |

Scale | Ratio that describes how the dimensions of a model are related to the actual object |

Similar Polygons | Same shape, congruent angles, proportional sides. |

Scale Factor | The ratio of 2 corresponding sides in similar figures. |

Theorem 6.1: Perimeters of Similar Polygons | If 2 polygons are similar, then the ratio of the perimeter = the ratio of the sides. |

Corresponding Lengths in Similar Polygons | If 2 polygons are similar, then the ratio of the 2 corresponding lengths = the scale factor. |

Postulate 22: AA Similarity Postulate | If 2 angles of one triangle are congruent to 2 angles of another triangle, then the triangles are similar. |

Created by:
mgill202