Critical Thinking Puzzles: Why are manhole covers round?

July 28, 2008

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

Unknown 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.; August 14, 2008 at 6:53 PM
Anonymous said...: An equilateral triangle will work too, but the hole has to be made bigger to allow the same size objects (people) down it.; October 14, 2008 at 5:57 PM
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.; November 11, 2012 at 12:07 PM

Critical Thinking Puzzles