I know it's because manholes are round, but why are manholes round?
2006-06-06 08:16:20 · 6 answers · asked by mary_sconster 3 in Education & Reference ➔ Trivia
so the cover wont fall in the hole. a round cover cant fit through the hole no matter which way it is turned.
2006-06-06 08:18:46 · answer #1 · answered by Kutekymmee 6 · 1⤊ 1⤋
Manhole covers are round because one of the strongest shapes against force put on it is a cylinder, so stand it on end and you have a manhole, but they are also triagular. Nashua, New Hampshire has triangular manhole covers that point in the direction of the underlying flow.
trivia--Microsoft uses this as an interview question
2006-06-06 20:41:01 · answer #2 · answered by bigmrawt 2 · 0⤊ 0⤋
If it was rectangular, square, or triangular it could be turned in a direction which would allow it to pass thru the hole leaving an open hole in the street to drive off into. Since this would be really bad they made them round so that no matter which direction they may get turned they will not fall thru the hole.
2006-06-06 15:23:41 · answer #3 · answered by Anonymous · 0⤊ 0⤋
a circle is geometricly the smallest shape (in area) for any given distance across aka. it's most economical
2006-06-06 17:13:49 · answer #4 · answered by California 2 · 0⤊ 0⤋
so the cover won't fall through the hole!
2006-06-06 16:37:22 · answer #5 · answered by Arielh 2 · 0⤊ 0⤋
so the MAN can fit throught the HOLE
2006-06-06 15:20:16 · answer #6 · answered by phillyfan11 1 · 0⤊ 0⤋