Yards.
Lakes are pretty big, and yards is a larger measurement than feet so yards would be an easier measurement.
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square feet and yards measure different things you can't change from one to the other. Square feet measure area and yards/feet measure length/distance.
You can not convert these, yards measure distance, and square feet is a measure of area.
Yards is a measure of lenght square feet is a measure of area. It is not possible to equate the two.
The piece is 2 yards by 4 yards ie 8 square yards. Square yards is a measure of area and there are no yards (a measure of distance) in square yards.
Square feet measure area, and yards measure length. If you mean FEET in 21 yards, the answer is 63 (3 times 21). If you mean square feet in 21 SQUARE YARDS, the answer is 189 (three times three times 21).