probably 15 or less
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6.35 Direct Conversion Formula0.25 in* 25.4 mm 1 in = 6.35 mm
250000mm
25*10 = 250 mm
Regardless of what you happen to be measuring,10 mm = 1 centimeter18 mm = (18/10) = 1.8 centimeter
The USA 25 cents (quarter) coin is ø 24.26 mm