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80% of 1 inch is 0.8 inches or 4/5 of an inch.
48
The area of a 2 by 2 inch square is 4 square inches. The formula is length times width. Like 4 inch by 6 inch. 4 times 6 equals 24 square inches
(80x80)/144 = 6400/144 = 3200/72 = 1600/36 = 800/18 = 400/9 = 44 and 4/9 square feet
It depends on the thickness of slab. A yard of cement contains 9 cubic feet. Thus, it would cover 9 square feet if the slab was 1 foot thick. For a 4 inch thick slab, it would cover 3 times as much area, or 27 square feet.