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Returning to Napoleon's River

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Author: Annie Fetter
Description: active problem Geometry, difficulty level 3. A soldier stands on the bank of a river and uses his cap to measure its width. How far off will he be if he drops his head even one degree?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=1599
Solution page: Problem #1599

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