Millimetres and millimetres are the same measurement. Therefore, 20 millimetres is equal to 20 millimetres.
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20mm
20 mm, which is equal to 2 cm.
You are seriously stupid if you honestly cannot work this out. 1cm is 10mm hence 2cm would be 20mm
great website for this: http://www.simetric.co.uk/metres_to_feet.php Direct Conversion Formula20 mm* 1 in 25.4 mm = 0.7874015748 in
10mm = 1cm so to convert mm to cm just divide by 10 example; 20mm /10 = 2cm