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Why do we preferably have round manhole covers and not the square ones ?

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Why do we preferably have round manhole covers and not the square ones ?
posted Jul 2, 2018 by Rahul Vaidya

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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.
A round manhole cover has a smaller surface than a square one, thus less material is needed to cast the manhole cover, meaning lower cost.

answer Jul 3, 2018 by Hanifa Mammadov
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