Asked by Anonymous

how to find how many ridges a 10 p coin has?
What do we measure and how do we work it out?

Answers

Answered by Steve
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.

Answered by Zahid
You need to add one as there is one extra ridge compared to the number of spacings between ridges
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