40 mm
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0.4cm
1,574803149606299 in
1 cm = 10 mm so 4 cm = 40 mm. Simple!
2cm is equal to 20mm Likewise, 4cm is equal to 10mm Because these are measured in the metric system, they are nice and easy to convert. You can use this as a guide. 1km=1000m 1m=100cm 1cm=10mm
1 cm = 10 mm ⇒ 4 cm = 4 x 10 mm = 40 mm