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Home > TED-Ed: Lessons Worth Sharing > Why are manhole covers round? - Marc Chamberland
Podcast: TED-Ed: Lessons Worth Sharing
Episode:

Why are manhole covers round? - Marc Chamberland
Category: Education
Duration: 00:03:35
Publish Date: 2018-02-16 07:00:06
Description: Why are most manhole covers round? Sure it makes them easy to roll, and slide into place in any alignment. But there’s another, more compelling reason, involving a peculiar geometric property of circles and other shapes. Marc Chamberland explains curves of constant width and Barbier’s theorem.
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