2006-06-26 03:27:15 · 4 answers · asked by Pradeep A 1 in Science & Mathematics ➔ Engineering
in the US, older one may be square but newer ones are round. Square ones can be rotated leaving a deangerous opening and they can be tilted and the will fal through the opening. These unsafe circumstances are done away with with round ones.
2006-06-26 03:30:18 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Almost all manhole covers are round. they are designed that way so the cover can not possibly fall into the hole. A square or rectangular cover could be turned so that it would fall into the hole.
2006-06-26 03:31:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Pretty much all of them are circular, because that shape won't fall through the hole. In places where it's not, it's usually a budget issue.
2006-06-26 03:30:13 · answer #3 · answered by effin drunk 5 · 0⤊ 0⤋
everthing should not be same other wise whos gonea wonder
2006-06-26 03:31:08 · answer #4 · answered by suyog 2 · 0⤊ 0⤋