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Seven Congruent Rectangles

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Author: Annie Fetter
Description: active problem Geometry, difficulty level 2. Seven congruent rectangles are arranged to form a larger rectangle. If the area of the large rectangle is 336 units^2, what's the perimeter of the large rectangle?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=591
Solution page: Problem #591

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