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July 28, 2008

Why are manhole covers round?

Why is it better to have round manhole covers
than square ones?

3 comments:

dipin said...

so that they do not fall in to the manhole as diagonal distance of square manhole will be more than length of cover but in case of round one , no such possibilities.

Secret Squïrrel said...

An equilateral triangle will work too, but the hole has to be made bigger to allow the same size objects (people) down it.

Dubeyhvyn said...

so that they do not fall in to the manhole as diagonal distance of square manhole will be more than length of cover but in case of round one , no such possibilities.