Why are coins round and not square or cubes, etc.?
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Coins come in all sorts of shapes, including hexagons and octagons, some with holes in the middle, some made from two different shades of metal, etc. If you look them up, there have been coins in just about every sort of shape you can think of. These days, increasingly. A rounded edge is easiest when considering the use of vending machines, so there has been a trend in that direction.
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