I like coins. I’m not a collector. The only coins I have in my possession are the odd foreign euro or dirham from holidays gone by, and a big pile of various UK coins. I’ve never sought a coin in particular, but maybe after this post I will.
I’m focusing, unsurprisingly, on the maths of coins. They come in all sorts of amazing mathematical shapes. I thought I’d show some of them to you. Let’s see how many polygons we can get through. I won’t bother with circles, because duh.
3: The Triangle
Another commemorative Australian Coin (a squircle!)
The Netherlands (generally circulated):
I think there was an old Indian Rupee that was square too.
Or how about this rectangular Galapagos $8 coin? No idea whether this was in circulation or commemorative. You’d think for a teeny place like that… well who knows.
There’s also a rectangular commemorative Korean coin:
5: The pentagon
Aah there’s loads of heptagonal coins. Let’s move swiftly on.
Maltese 25 cent coin:
Kenyan 5 shillings:
We’re learning new words now!
UK Pound Coin (Coming 2017!)
UK 3 pence (back in the day!)
We’re getting silly now!
Phew! We’re practically full circle (pun intended).
I can’t find a coin with more sides than this. Can you?