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In the diagram below, BC and DE are parallel. Find Y

https://latex.artofproblemsolving.com/c/8/2/c8262fe365222b9b6df5ffa85da4197a4886bc96.png

 Oct 8, 2019
 #1
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CBF and DEF are similar.

 

DEF's side lengths are half the length of CBF's. Therefore, if EF's length is 9, then BF's length is double that. Can you solve it?

 Oct 8, 2019

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