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Two variables are proportional when they have a constant ratio

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each ratio is equivalent to 1/2

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triangle ABC is similar to triangle DEF

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10/20 = 6/12 = 7/14

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AB = BC = AC

DE    EF     DF

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same shape but different size

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Similar figures

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Shapes

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Proportional relationship

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Solve problems

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Mathematical process standards to use geometry to describe or solve problems involving proportional relationship.
Students are expected to generalize the critical attributes of similarity, including ratios within and between similar shapes

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Proportionality