None.
A yard 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 without some addition information.
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4 yards by 1 yard = 12 feet by 3 feet = 36 square feet
81 Square feet.
1 acre = 4840 square yards x 9 (square feet in a square yard) x 4 = 174240
81 square feet
6 feet by 4 feet is 24 square feet. There are 9 square feet in a square yard, so 24 square feet is 2 and 2/3 square yards (2.666 square yards).