Posted by Anonymous on Monday, March 26, 2012 at 3:51pm.
this is physics?
measure the circumference C of the coin
measure the distance D between two ridges
number of ridges = C/D
For example, if the coin is 5 cm around, and each ridge occupies 1 mm (.1 cm), then there are 5/.1 = 50 ridges.
You need to add one as there is one extra ridge compared to the number of spacings between ridges
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