21 feet and 4 inches
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21.3 repeating.
256 ft2
1.78 ft2
16x16 ft = 256 square feet = 36,864 square inches.
6 inches = 0.5 feet 256 square feet * 0.5 = 128 cubic feet There are 27 cubit feet in a cubic yard (3 feet x 3 feet x 3 feet), so 128 cubic feet = 4.741 cubic yards.