The side of the square is 1/2 sqrt(2) feet = 8.485 inches. (rounded)
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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.
Divide by 144. 1ft = 12in 1 sq ft = 1ft x 1ft = 12in x 12in = 144 sq in thus 1 square foot is the same as 144 square inches. So to convert square inches to square feet divide by 144.
1ft 2in = 14in Area = pi*72 = 153.938 square inches to 3 decimal places
Each brick has an area of 1ft x 1ft ie 1 sq foot. So you would need 308 bricks.
depends if you mean 1) 7 x 1ft. sq. OR 2) 7ft. sq