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The crosssection of a is a trapezoid whose sides are inclined at 25. The area of the gutter is 12 dm2. In order to reduce

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The crosssection of a is a trapezoid whose sides are inclined at 25. The area of the gutter is 12 dm"2. In order to reduce the flow resistance in the cross sectional pattern, 1he total length of its sides and bottom is tried to be as small as possible. How should the crosssection be dimensioned

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