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The "Middle" Triangle

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Author: Annie Fetter
Description: active problem Geometry, difficulty level 2. In rectangle ABCD, E is the midpoint of BD, F is the midpoint of ED, AD is 10 cm, and AB is 20 cm. What's the area of AEF?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=2007
Solution page: Problem #2007

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