math ch 6 vocab... postulates... theorems
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 numbers using division
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| proportion | An equation that states that two ratios are equal
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| means | in a/b=c/d, a and c are means
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| extremes | in a/b=c/d, a and d are extremes
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| geometric mean | two positive numbers a and b is the positive number x that satisfies a/x = x/b. So, x squared = ab and x = √ab.
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| scale drawing | a drawing that is the same shape as the object that it represents.
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| scale | the ratio that describes how the dimensions in the drawing are related to the actual dimensions of the object
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| similar polygons | two polygons are similar if corresponding angles are congruent and corresponding side lengths are proportional.
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| scale factor | two polygons are similar, then the ratio of the lengths of two corresponding sides
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| dilation | the transformation that stretches or shrinks a figure to create a similar figure.
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| center of dilation | in a dilation, a figure is enlarged or reduces with the respect to a fixed point
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| scale factor of 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 | if 0<k<1, the dilation of a reduction.
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| enlargement | if k>1, the dilation is an enlargement.
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