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.
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There are 10mm in 1cm. Therefore there are 102mm2 in 1cm2 which equals 100 square millimetres.
1 cm squared is 10mm by 10mm so 1cm squared equals 100mm squared
0.01m= 1 cm 1cm=10mm
The radius will stay as 1cm but the area of a circle is: pi times radius squared
1cm = 10mm ⇒ 18.7cm = 18.7 x 10mm = 187mm