You need to redefine your question. Square footage is a measurement of area whereas "7ft" is a measurement of length. The question makes no sense. Taken at face value, there are 7 square feet in 7 feet. 1ft x 1ft = 1ft.
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That's a total of 140 ft2
7ft 5 * 150 ft = 75/12 ft * 150 ft = 89/12 ft * 150 ft = 89 *12.5 sq ft = 1112.5 sq ft
16 ft x 7 ft = 16 x 7 square ft = 112 sq ft
If a rectangle measures 7ft wide by 37ft long, then the area is 7 x 37 = 259 sq ft.
12ft 2 in * 7ft 2 in = 121/6 ft * 71/6 ft = 87.1944... sq feet