None.
A centimetre is a measure of distance while a square inch is a measure of area. The two measure different things and according to basic dimensional analysis conversion from one to the other is not a valid operation.
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14.3 square inches is 92.26 square cm
3.5cm2 = 0.5425 square inches.
The answer is 1451.61 square centimeters. 1 square inch is equal to 6.4516 square centimeters. So multiply the number of square inches by 6.4516 to convert.
8.40 square inches = 54.19344 square centimeters.
An inch is a unit of distance. A square centimetre is a unit of area. The two units are therefore incompatible.