The volume of a box is its length times its width times its height so to construct a box with a volume of 0.78 cubic feet you need three numbers, length, width and height so that
length width height = 0.87
So, for example you could construct a box with length 1 foot, width 1 foot and height 0.87 feet. Another possibility is a box that has length 2 feet, width 1 foot and height 0.435 feet.
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