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Manholes are round to prevent them from falling back into the hole. They are manufactured with an indention around the edges to allow them to fit flush with the surface. If they were square (or any shape other than round), it would be possible to lift and turn it so that it the cover fell into the hole -- both expensive to replace and very dangerous to anybody down below.

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13y ago

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Q: What might happen if manholes are any shape but round?
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