You don't convert cubic units to square units, or vice versa. A mile has 5280 feet, each foot has 12 inches, therefore, a mile has 63360 inches. A square mile has 633602 square inches, and a cubic mile has 633603 cubic inches.
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The number 1728 is used when converting cubic inches to cubic feet. Since there are 12 inches in a foot (12 x 12 x 12 = 1728), this conversion accounts for the volume in three dimensions when moving from cubic inches to cubic feet.
First, convert 2400 sq ft to square meters (1 sq ft = 0.0929 sq m). Next, convert 6 inches to meters (1 inch = 0.0254 meters), then multiply the area in square meters by the depth in meters to get the volume in cubic meters.
To cover 144 sq ft with soil to a depth of 6 inches, you would need 72 cubic feet of soil. This can be calculated by multiplying the area (144 sq ft) by the desired depth (6/12 ft) to get the volume in cubic feet.
1 sq ft = 144 sq inches 1 sq ft x 1 inch deep = 144 cubic inches / (231 cubic inches per gallon) = 0.6234 gallon (rounded)
To convert 400 square feet at 5 inches deep to cubic yards, first convert depth to yards (5 inches = 5/36 yards). Then, multiply 400 sq ft by the depth in yards to get the volume in cubic feet (400 * 5/36 = 55.56 cubic feet). Finally, convert cubic feet to cubic yards (1 cubic yard = 27 cubic feet), giving you approximately 2.06 cubic yards.