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I think there is a useful distinction that we are missing on this page.
A Reuleaux polygon can have any number of sides >= 2, but it is only a curve of constant width when the number of sides is odd.
The Mathworld entry for Reuleaux polygon implies this. I will try to find some better references than those we have already.
The article about the 2016 £1 coin is particularly feeble I thought. Thruston (talk) 17:01, 27 December 2021 (UTC)[reply]
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