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ABCD is a square with a side of 18 in. M and N are midpoints of AB and CD, respectively. Polygonal chains AEC and AFC divide the square into 3 parts of the same area. What is the length of EF?

 

I took a screenshot of the diagram but it didn't work.

 Mar 1, 2020
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The length of EF is sqrt(7).

 Mar 3, 2020

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