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Ratio
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Compares two numbers by division.
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Proportion
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Is an equation stating that two ratios are equal.
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Extremes
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In the proportion a and b are the extremes.
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Means
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In the proportion b and c are the means.
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Cross Products
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In the statement bc and ad are the cross products.
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Similar
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Have the same shape but not necessarily the same size.
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Similar Polygons
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Two polygons whose corresponding angles are congruent and whose corresponding side lengths are proportional.
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Similarity Ratio
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Is the ratio of the lengths of the corresponding sides of two similar polygons.
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Dilation
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A transformation in which the lines connecting every point P with its preimage P' all intersect at a point C known as the center of dilation.
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Scale Factor
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Describes how much the figure is enlarged or reduced.
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Indirect Measurement
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A method of measurement that uses formulas, similar figures, and/or proportions.
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Scale Drawing
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Represents an object as smaller than or larger than its actual size.
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Scale
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Is the ratio of any length in the drawing to the corresponding actual length.
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