The most compact shape 77.5 square inches can be is a circle with a radius of of 4.97 inches (approx).
It can be a rectangle that is 10 inches long and 7.75 inches wide or
1 mile long and 0.0012232 inches wide (approx) or even longer and thinner.
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The area as a square has a width of 28.28 inches and a length of 28.28 inches.
100 square inches.
96 square feet big. ...alternatively it is 1152 square inches, or approximately 29.5 square metres.
2304 in2
72 square meters is 775 (775.002) square feet.