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### 10 Cards in this Set

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 ratio The ratio of x to y (y is not equal to 0) is x\y and is sometimes written x:y. proportion An equation stating that two ratios are equal. The first and last terms are the extremes; the middle terms are the means. extremes the first and last terms of a proportion means the middle term of a porportion geometric mean If a, b, and x are positive numbers with a\x=x\b, then x is the geometric mean between a and b. similar polygons Two polygons are similar if their vertices can be paired so that corresponding angles are congruent and corresponding sides are in proportion. scale factor For similar polygons, the ratio of the lengths of two corresponding sides. dilation a type of transformation reduction A DILATION WITH 01