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Old 08-07-2011, 12:02 PM   #8
dnsfpl
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Join Date: Mar 2008
Posts: 1,659
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for slope we can use the formula for volume of Trapezium

IE sum of parallel lines / 2 * W * L = (7 + 4) / 2 * 30 * 60 = 9.9l

cheers
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