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Unit 1 Geometry Chapter 7 Similarity

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Vocabulary Word
Definition
Proportion   An equation stating that two ratios are equal  
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Extremes   The outer values of a:b = c:d. (a and d are extremes)  
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Means   The inner values of the proportion a:b=c:d. (b and c are the means)  
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Cross products   The product of the means and the extremes. (ad = bc)  
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Ratio   The comparison of two numbers using division  
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Similar Figures   Figures that have the same shape but not necessarily the same size  
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Similar Polygons   Corresponding angles are congruent and corresponding side lengths are proportional  
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Similarity Ratio   The ratio of the lengths of the corresponding sides of two similar polygons  
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Indirect Measurement   Any method that uses formulas, similar figures, or proportions to measure an object  
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Scale Drawing   Representing an object as smaller or larger than its original size  
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Scale   The ratio of any length in the drawing to the corresponding actual length  
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Dilation   A transformation that changes the size of a figure but not its shape  
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Scale Factor   How much a figure is enlarged or reduced  
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