It would be a 20 by 20 ft square
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To determine the number of 12x12 inch tiles needed to cover 400 square feet, first calculate the area of one tile in square feet. Each tile covers 1 square foot (12 inches x 12 inches = 144 square inches = 1 square foot). Then divide the total area to be covered (400 square feet) by the area of one tile (1 square foot) to find the total number of tiles needed. In this case, it would take 400 tiles to cover 400 square feet with 12x12 inch tiles.
1 acre = 43,560 square feet400 ft x 400 ft = 160,000 square feet = (160,000 / 43,560) = 3.673 acres (rounded)
one square foot is equal to 0.0929 square meters, multiply this by 400 and the answer is 37.16 square meters
400 square feet (20 x 20 = 400)
400 sq cm equals 0.43 square feet.