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A Parabola Proof

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Author: Leigh Nataro
Description: teacher support active problem Trig/Calc, difficulty level 3. Prove that the area of a parabola is 2/3 the product of its width and height.
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=834
Solution page: Problem #834

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