None because they are both describing the same thing in square cm
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There are 10mm in a cm. However, when talking about the area, the units are squared, and so too is the difference between cm and mm. 10x10 is 100, which is the conversion factor. 1cm^2 is 100mm^2.
2500 cm squared
== 25x25== 625 Rectangle sides 5 cm each. ==
?
25cm^2= 625cm 625cm*6.3=3937.5