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Chapter 6 Vocabulary

ratio a comparispn of two numbers using division
proportion an equation that states that two ratios are equal
extreme the first and last terms of a proportion
geommetric mean for 2 positive numbers a and b, the positive number x that satifies a/x = x/b. so x(2)= ab and x= sqrt. of ab.
scale drawing a drawing that is the same shape as the object it represents
scale a ratio that describes how the demensions in a scale drawing are related to the actual demensions of the object
similar polygons two polygpns such that their corresponding angles are congruent and the lengths of the corresponding sides are proprotional
scale factor of two similar polygons the ratio of the lengths of two corresponding sides of two similar polygons
dilation a transformation that stretches of a shrinks a figure to create a similar figure
center of dilation in a dilation, the fixed point about which the figure in=s enlarged or reduced
scale factor of a dilation in a dilation the ratio of a side length of the image to the correponding side length of the original figure
reduction a dilation with a scale factor between 0 and 1
enlargement a dilation with a scale factor greater than 1