There is no equivalence.
A linear foot is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. 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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21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.
21*3 = 63 square feet.
21 inches equals how many feet?
21 yards in feet is 21*3 = 63 feet.21 yards in feet is 21*3 = 63 feet.21 yards in feet is 21*3 = 63 feet.21 yards in feet is 21*3 = 63 feet.
21