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14 Cards in this Set
- Front
- Back
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Ratio
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A comparison of 2 numbers using division. The ratio of a to b, where b cannot equal 0, can be written as a to b, as a:b, or as a over b
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Proportion
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An equation that states that 2 ratios are equal
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Means
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The middle terms of a proportion
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Extremes
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The first and last terms of a proportion
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Geometric Mean
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For two positive numbers a and b, the positive number x that satisfies a over x equals x over b, so x squared= ab and x=the square root of ab
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Scale Drawing
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A drawing that is the same shape as the object it represents
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Scale
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A ratio that describes how the dimensions in a scale drawing are related to the actual dimensions of the object
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Similar Polygons
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Two polygons such that their corresponding angles are congruent and the lengths of corresponding sides are proportional
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Scale Factor of Two Similar Polygons
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The ratio of the lengths of two corresponding sides of 2 similar polygons
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Dilation
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A transformation that stretches or shrinks a figure to create a similar figure
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Center of Dilation
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In a dilation, the fixed point about which the figure is enlarged or reduced
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Scale Factor of a Dilation
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In a dilation, the ratio of a side length of the image to the corresponding side length of the original figure
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Reduction
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A dilation with a scale factor between 0 and 1
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Enlargement
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A dilation with a scale factor greater that 1
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