To answer your question; none. You have to have the other side before you can figure out the square feet.
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90-ft x 7-ft = 630 square feet
456 ft
90 x 7 = 630 sq ft
156.208 square feet.
7 ft 6 in x 11 ft 6 in = 7.5 ft x 11.5 ft = 86.25 sq feet.