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ratio a comparison of two quantities by division. rate a ratio that compares quantities measured in different units. unit rate the rate for one unit of a given quantity, unit cost a unite rate that gives the cost per unit. cross products two products found by multiplyhi9ng the denominator of each ratio by the numerator of the other ratio. proportion an equation stating that two ratios are equal. similar polygons if the corresponding angles have the same measure and the lengths of the corresponding sides form equivalent ratios. scale drawing an enlarged or reduced drawing of an object that is similar to the actual object. scale the ratio that compares a length in a drawing or midel to the corresponding length in the actual object. polygon a closed plane figure formed by three or more line segments that do not cross. equivalent ratios two ratios that name the same number