View full lesson: http://ed.ted.com/lessons/why-are-manhole-covers-round-marc-chamberland
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.
Lesson by Marc Chamberland, animation by Pew36 Animation Studios.
Tagged under: TED,TEDx,TED-Ed,TED Education,Marc Chamberland,Manhole,Manhole cover,Circle,Geometry,Curve constant width,Width,Radius,Diameter,Barbier' theorum,Reuleaux triangle,Releaux polygon,Pew36 Animation
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