Oh, dude, let me break it down for you. So, 2cm is the same as 20mm, right? And if 4mm is a part of that 20mm, then the fraction would be 4/20, which simplifies to 1/5. So, 4mm of 2cm is like 1/5. Easy peasy, right?
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fraction: 2cm/1cm = 2/1
fraction of 4 cm is 4mm = 1/101 cm = 10mm4 cm = 40mm4mm/4cm = 4mm/40mm = 4/40 or 1/10
fraction = 30/160cm/2cm = 60/2 or 30/1
Approx 0.1575 inches.
It is = 40/254, which can be simplified if required.