Read the following SAT test question, then click on a button to select your answer.
In the figure above, 
ABC is similar to DEF. What is the length of the side 
?
- 4
- 5
Hint
The triangles are similar, so their corresponding sides are proportional. That is, there exists a positive number n such that n(AB) = DE, n(AC) = DF, and n(BC) = EF.
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