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81 inches = 2.25 yards
There are 36 inches in one yard. Therefore, 81 yards is equal to 81 x 36 = 2916 inches.
81 square yards
81 feet.
To convert square feet to square yards, divide the area in square feet by 9, since there are 9 square feet in a square yard. Therefore, 81 square feet is equal to 81 ÷ 9 = 9 square yards.