81 square feet
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A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
6 inches is 1/6 of a yard, so a cubic yard of concrete will cover 6 sq yards = 54 sq ft
about 26.4 is the volume i think.......
one (1) cubic yard of concrete four inches thick will cover 80 sq. feet. 85 yards x 81 = 6885 sq. feet.
1 "yard" of concrete actually = 1 cubic yard = 27 cubic feet27 = (2/3) x81 = 2 xx = 40.5 square feet