Why are coins round and not square or cubes, etc.?
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The corners on triangles, squares etc. would wear off from usage. A circle is the only shape that doesn’t have corners.
Coins at flat from the way they’re made: a small plug of metal is placed in a die that is then struck or pressed together, flattening the metal. That is how you get the designs on the heads/tails side of the coin.
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