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The Return of the Parallelogram II

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Author: Annie Fetter
Description: Geometry, difficulty level 3. Draw a parallelogram ABCD with AB=10. Draw EF with E between A and B and F between C and D such that EF divides the area of ABCD in half. If EF=4, what is the area of the parallelogram?
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Problem page: /library/go.html?destination=1047
Solution page: Problem #1047

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