By removing a dimension, which involves dividing by a length measured in cm.
cm3 are a measure of volume
cm2 are a measure of area
Converting the former into the latter is not something that is done every day.
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The volume should be 200 cm3, not cm2. Density = Mass/Volume = 120g /200 cm3 = 0.6 g/cm3
Formula: kg/cm2 x 9.807 = newtons/cm2
cm2 = (10mm)2= 100 mm2.
There are 10 cm in 1 dm Then there are 102=100 cm2 in 1 dm2 and there are 103=1000 cm3 in 1 dm3
You times the m2 by 10,000 to get cm2. and You divide cm2 by 10,000 to get m2