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# ch 6 math

### math ch 6 vocab... postulates... theorems

ratio a comparison of two numbers using division
proportion An equation that states that two ratios are equal
means in a/b=c/d, a and c are means
extremes in a/b=c/d, a and d are extremes
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.
scale drawing a drawing that is the same shape as the object that it represents.
scale the ratio that describes how the dimensions in the drawing are related to the actual dimensions of the object
similar polygons two polygons are similar if corresponding angles are congruent and corresponding side lengths are proportional.
scale factor two polygons are similar, then the ratio of the lengths of two corresponding sides
dilation the transformation that stretches or shrinks a figure to create a similar figure.
center of dilation in a dilation, a figure is enlarged or reduces with the respect to a fixed point
scale factor of a dilation the ratio of a side length of the image to the corresponding side length of the original figure.
reduction if 0<k<1, the dilation of a reduction.
enlargement if k>1, the dilation is an enlargement.
Created by: the cat