The question has no meaning: sq feet is a measure of area whereas feet is a measure of length.
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90 x 7 = 630 sq ft
There are three feet in a yard. A square a yard long and a yard wide would be three feet on each side and contain nine square feet. 1 sq yd = 3 ft X 3 ft = 9 sq ft... If there are nine square feet in one square yard, then there would be nine times seventy square feet in seventy square yards. 9 X 70 = 630 There are 630 square feet in seventy square yards.
630 sq. Ft.
27,878,400 sq ft.
1 yd = 3 ft 1 sq yd = 1 yd x 1 yd = 3 ft x 3 ft = 9 sq ft ⇒ 70 sq yds = 70 x 9 sq ft = 630 sq ft