None.
A yard is a measure of length or distance while a square yard is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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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.
42 sq yds
14 yards are in 42 feet.
42 feet is equivalent to 14 yards.
A circle with a radius of 21 yards has an area of 1,385.44 square yards.