manhole!why are they round?

@BYOLA2871 (4373)
South Africa
February 15, 2008 7:59am CST
I happen to have been in the construction industry for a while but never thought about this question until i read something pertaining to that in the newspaper.Just for explanantion sake a manhole covers the access points to the sewer and allows people to eneter to clean and maintain the sewers below,so why do you think manholes are round?
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