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Building a Rain Gauge

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Author: Annie Fetter
Description: active problem Geometry, difficulty level 3. Given the depth of the water in a bottle, figure out how much rain really fell, considering that the opening of the bottle is much smaller than the main part.
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=1719
Solution page: Problem #1719

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