Arabic numbers: why are they shaped like that?

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In the image from above you can see why the numbers are looking the way they look now. We can say that we chose style over function, but you get the idea. Number one should have only one angle, number two should have two angles and number three should have four angles.

Today we do not use that exact notation, but at least we can understand now why the numbers are shaped like that. Clever guys those Indians and clever guys those Arabs who brought these numbers over to us. Roman numbers are awful to work with.
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