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What manhole covers are circular?

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What manhole covers are circular?
posted Apr 23, 2016 by anonymous

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1 Answer

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Reasons for the shape include: A round manhole cover cannot fall through its circular opening, whereas a square manhole cover may fall in if it were inserted diagonally in the hole. The existence of a "lip" holding up the lid means that the underlying hole is smaller than the cover, so that other shapes might suffice.

answer Apr 26, 2016 by Shivaranjini
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