1 cm = 10 mm so 1 cm2 = 10*10 mm2
So 80.2 cm2 = 80.2 * 100 mm2 = 8020 mm2
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1 mm is 1/10 of a cm, so 1 mm2 is 1/100 of a cm2.
100
828826031.43
You can't convert one to the other. Inches is a unit of length, cm2 is a unit of area.
These units are not directly convertible. cm2 are surface area. cm3 is cubic volume.