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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.
The side of the square is 1/2 sqrt(2) feet = 8.485 inches. (rounded)
1ft = 12in 1ft3 = 1ft x 1ft x 1ft = 12in x 12in x 12in = 1728in3 => 3.25ft3 = 3.25 x 1728in3 = 5616in3
12in = 1ft Therefore 8in + 4in = 12in = 1ft 1ft + 8ft + 2ft = 11ft
This tank contains V = 2ft x 1ft x 1ft = 3ft3. Alternatively: V = 0.76m x 0.38m x 0.38m = 0.110m3 = 110dm3 = 110 litres.