2006-12-18 16:24:18 · 14 answers · asked by muttley 2 in Social Science ➔ Psychology
A circle requires the least amount of material to manufacture per given square area. In other words, it takes more metal to make a square lid than a round lid. Also, a round manhole cover won't drop through the opening.
2006-12-18 16:30:36 · answer #1 · answered by guru 2 · 0⤊ 0⤋
I would think it was the simplest shape to put it in. Also, If it was a square and a car drove over on end, it may come out. In the form of a circle it is harder for this to happen.
2006-12-19 00:29:34 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The cover cannot fall through the opening --as a rectangle shape could.
2006-12-19 00:26:28 · answer #3 · answered by NuncProTunc 3 · 1⤊ 0⤋
Easier to drop back into place. No corners to line up. Those things weigh like 200 pounds--you don't want to fiddle with them anymore than you have to.
2006-12-19 00:25:58 · answer #4 · answered by maamu 6 · 0⤊ 0⤋
!? thats a good point...i mean why didn't they make them square or sumthing...hmmm...maybe hollywood was like the first one to use a manhole in a movie or somthing, and a monster popped out of it, and then other cities starting using them...hmmm...yeah thats it.
2006-12-19 00:27:42 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Even distribution of load for given area.
2006-12-19 00:33:53 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Because the men that go in them are round.
2006-12-19 00:27:26 · answer #7 · answered by Anonymous · 0⤊ 0⤋
They weigh almost 100 pounds. When you open them you can roll them aside.To heavy to carry.
2006-12-19 00:26:21 · answer #8 · answered by danp 3 · 1⤊ 0⤋
so it doesnt fall in and so its easier when u put it back down you dont have to worry about which way it goes
2006-12-19 00:25:45 · answer #9 · answered by Anonymous · 0⤊ 0⤋
so the circular man hole covers don,t fall through.
2006-12-19 00:29:57 · answer #10 · answered by morbidsmindtrip 3 · 0⤊ 0⤋