Proportions and Similarity
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| ratio | a comparison of two quantities using division.
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| Extended ratios | can be used to compare three or more quantities, example a:b:c
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| proportion | an equation stating that two ratios are equal
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| extremes | In the proportion a/b=c/d, a and d are the extremes
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| means | In the proportion a/b=c/d, b and c are the means
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| cross products | the product of the extremes ad and the product of the means bc are the cross products
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| Cross Products Property | In a proportion, the product of the extremes equals the product of the means.
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| Equivalent Proportions | a/b=c/d, b/a=d/c, a/c=b/d, c/a=d/b
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| Similar Polygons | Two polygons are similar IFF their corresponding angles are congruent and corresponding side lengths are proportional. Their shape is the same, but not necessarily their size.
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| Similarity Ratio | The scale factor between two similar polygons
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| Scale Factor | the ratio of the lengths of corresponding sides of two similar polygons. It depends upon the order of comparison.
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Created by:
amgeometry
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