You don't. One measures length, the other measures area.
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You cannot change square centimeter to centimeter. The square centimeter is a measure of area and the centimeter is a measure of distance.
One square centimeter equals a square centimeter.
An abbreviation for square centimeters is cm2.
1 square centimeter = 0.0001 square meters
1 square centimeter = 1.0e-8 square hectometer