About 0.012 (1/80) acre.
520 (square feet) = 0.0119375574 acres
An acre is 4840 square yards or 43560 square feet.
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520 square feet = 57.7 square yards.
520
10' by 10' with 8-ft ceilings: -- Floor = 100 square feet -- Ceiling = 100 square feet -- Each wall = 80 square feet Total interior surface area of the room = (2 x 100) + (4 x 80) = 520 square feet. (Less windows, recessed light fixtures, doors, electrical outlets, etc.)
That will depend on the part of the country it's in, as well ason the state, the city, and the neighborhood in that city.
There are an infinite number for numbers for length and width that will give an area of 1080 square feet. However, using only integer values, there are 32 pairs of values that will give 1080 square feet: 1 * 1080 2 * 540 3 * 360 4 * 270 5 * 216 6 * 360 8 * 135 9 * 120 10 * 108 12 * 90 15 * 72 18 * 60 20 * 54 24 * 45 27 * 40 30 * 36 36 * 30 40 * 27 45 * 24 54 * 20 60 * 18 72 * 15 90 * 12 108 * 10 120 * 9 135 * 8 180 * 6 216 * 5 270 * 4 360 * 3 520 * 2 1080 * 1