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# Chapter 7 Similarity

### Unit 1 Geometry Chapter 7 Similarity

Vocabulary WordDefinition
Proportion An equation stating that two ratios are equal
Extremes The outer values of a:b = c:d. (a and d are extremes)
Means The inner values of the proportion a:b=c:d. (b and c are the means)
Cross products The product of the means and the extremes. (ad = bc)
Ratio The comparison of two numbers using division
Similar Figures Figures that have the same shape but not necessarily the same size
Similar Polygons Corresponding angles are congruent and corresponding side lengths are proportional
Similarity Ratio The ratio of the lengths of the corresponding sides of two similar polygons
Indirect Measurement Any method that uses formulas, similar figures, or proportions to measure an object
Scale Drawing Representing an object as smaller or larger than its original size
Scale The ratio of any length in the drawing to the corresponding actual length
Dilation A transformation that changes the size of a figure but not its shape
Scale Factor How much a figure is enlarged or reduced
Created by: rgilpatric