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# Triangle Proportionality

## Sides divided by a line parallel to the third side of a triangle.

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Practice Triangle Proportionality
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Which Side is Proportional?
Teacher Contributed
ABC$\triangle{ABC}$ is similar to DEF$\triangle{DEF}$. Their sides are proportional. What is the correct value for the unknown in the following statement? ?DE$\frac{?}{DE}$ = BCEF$\frac{BC}{EF}$ = ACDF$\frac{AC}{DF}$
qid: 100275