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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 0<K<1
enlargement
a dilation with k>1