Question

Question-- Why are manhole covers round?
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Answer 1

Explanation:

Why are manhole covers round? Could there be a structural reason? Why aren't manhole covers square? It would make it harder to fit with a cover. You'd have to rotate the cover exactly the right way. Therefore, many manhole covers are round so they don't need to be rotated. There are no corners to deal with. Also, a round manhole cover won't fall into a hole because it was rotated the wrong way, so it's safer.

There may be other reasons why corners are a problem and why a round shape is better. You can't cut yourself on a round manhole cover. And because it's round, it can be more easily transported. One person can roll it.