"regular feet" are one-dimensional measurements. Square feet are measures of area--two dimensional measurements. A square foot is a square that has foot long sides. 9 square feet are the area equivalent of 9 square feet.
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117 square feet
9*13 = 117 square feet
9 A square yard is 3 feet across and 3 feet long. 3x3=9
99 square feet !
There are 9 square feet in 1 square yard - so 15 square yards contains 9 x 15 = 135 square feet.