why are manholes always circular in shape?

@mgr1987 (689)
India
January 12, 2007 12:34am CST
i have this question in my mind for many years.but still i'm not able to find the answer for it.can anybody help me with regard to this question?
2 people like this
2 responses
zeusgods
@zeusgods (95)
• India
12 Jan 07
man,do you want me to study my science subjects again?for god's sake,i don't know the answer to this question.
finlander60
@finlander60 (1804)
• United States
12 Jan 07
The reason that manholes, and their covers, are round is because any other shape would make it possible for them to fall inside.