Posts Tagged: coins


15
Feb 10

Shapes of constant width – coins from around the world

In a previous post I talked about shapes of constant width. I didn't know of any other coins besides the UK 50p and 20p that had the property of being the same width all the way round without being circular.

Well I was recently given this coin instead of 20p:

Shapes of constant width   coins from around the world Continue reading →


23
Sep 09

50p coins make great wheels

50p coins make great wheels

50p coins are too pointy to use as wheels. Or so I thought. Continue reading →