Why are most manhole covers round?
1 year ago
9.27K
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.Imagine a square separating two parallel lines.As it rotates, the lines first push apart,then come back together.But try this with a circle and the lines stay exactly the same distance apart,the diameter of the circle.
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