There are 9 sq feet in a square yards. So this means it is 64 square feet.
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18 feet is 6 yards, and 21 feet is 7 yards. 6 multiplied by 7 is 42. Therefore, it's 42 square yards.
5 ft*7ft = 5/3 yards*7/3 yards = 35/9 square yards = 3.88... sq yards.
7 sq yd = 63 sq ft
7 yards 2 feet = 23 feet
7*5 = 35 square yards