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princeofpersia79
Lv 5
why are manhole covers usually round?
Why are manhole covers usually round? I have seen a few square ones, but they are usually round.
1 Answer
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- TheProfessorLv 52 decades agoFavorite Answer
It's kind of neat. Only a round cover will not fall through the hole it covers. Any other shape, if turned the wrong way can slip through the hole and fall.
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