Chapter 6 Vocabulary - Similarity
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| center of dilation | in dilation, the fixed point about which the figure is enlarged or reduced
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| dilation | a transformation that stretches or shrinks a figure to create a similar figure
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| enlargement | a dilation with a scale factor larger than one
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| extremes of a proportion | the first and last terms of a proportion
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| geometric mean | for two positive numbers a and b, the positive number x that satisfies a/x = x/b; so x squared = ab and x = the square foot of ab
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| means of a proportion | the middle terms of a proportion
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| proportion | an equation that states that two ratios are equal
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| ratio of a to b | a comparison of two numbers using division; the ratio of a to b, where be does not equal 0, can be written as a to b, as a:b, or as a/b
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| reduction | a dilation with a scale factor between 0 and 1
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| scale | a ratio that describes how the dimensions in a scale drawing are related to the actual dimensions of the object
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| scale drawing | a drawing that is the same shape as the object it represents
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| scale factor of a dilation | 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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| scale factor of two similar polygons | the ratio of the lengths of two corresponding sides of two polygons
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| similar polygons | two polygons such that their corresponding angles are congruent and the lengths of corresponding sides are proportional
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