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The Cross Section of a Drain Is a Trapezoid, as Shown

Question 39

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The cross section of a drain is a trapezoid, as shown in the figure. The sides and the bottom of the trapezoid are each ​a = 9 ft long. Determine the angle The cross section of a drain is a trapezoid, as shown in the figure. The sides and the bottom of the trapezoid are each ​a = 9 ft long. Determine the angle so that the drain will have a maximal cross-sectional area. ​ ​ __________° so that the drain will have a maximal cross-sectional area.
​ The cross section of a drain is a trapezoid, as shown in the figure. The sides and the bottom of the trapezoid are each ​a = 9 ft long. Determine the angle so that the drain will have a maximal cross-sectional area. ​ ​ __________° ​ The cross section of a drain is a trapezoid, as shown in the figure. The sides and the bottom of the trapezoid are each ​a = 9 ft long. Determine the angle so that the drain will have a maximal cross-sectional area. ​ ​ __________° __________°

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