Coin size ( length )
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Coin size ( length )
A coin is round and doesn't have a length. I'm assuming you mean the diameter.
What do you mean by "how" do you measure it?
Simple, you measure its diameter then proceed to use the following:
2 * pi * r where r is half the diameter. This gives you the perimeter of the coin which I suppose is what you meant by length.
And if you want a precise measurement, you can make use of a pair of vernier callipers.
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