Answered

why are manholes or utility hole covers are always round and not some other polygons or conic shapes

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ASHLODICAKESGAMINGGO

Answer:

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. ... Also, a round manhole cover won't fall into a hole because it was rotated the wrong way, so it's safer.

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