Depends on the depth.
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1 cubic yard of concrete fills 27/depth in feet square feet.
81 square feet
3500 feet = 0.662878788 miles
3500 mm = 11.48 feet.
it equals nine square feet * * * * * Nine square feet is 1 square yard, NOT 1 yard. In any case, "a yard" of concrete is used by builders' merchant to mean a CUBIC yard of concrete.