Nothing.
A cm square is a measure of area while an inch is a measure of distance. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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288 square inches is equal to 2 square feet.
13.3 square inches is equal to 85.806 square centimetres.
A square foot is a unit of area, not length. Since a square foot is 12 inches by 12 inches, that means it is 144 square inches.
A square inch is a unit of area measurement which is equal to a square measuring one inch on each side. When converted, 350 square inches is equal to 0.225806 square meter.
All four sides of a square are of equal length. If the 4 equal sides total 40 inches, then each side is 10 inches (40/4 inches = 10 inches).