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Why is a manhole cover round shape?

With this issue faced today in the courses. The answer is simple, who can respond immediately?





Source:
Pictures
Manhole covers and their history
The idea of a harmonious garden: flower beds and terraces round shape
Why do round the garden
Protein stuck in manhole cover in the city Aysenhagen, northern Germany.
Miraculously survived: in lobovuhu hatch flew ...!
Unconscious ask the right questions
Byzantine iPad found by archaeologists in Bosphorus
Underground station in Spanish logroño
Microloans without restrictions
A trick question on interview
...
Manhole covers and their history
...
The idea of a harmonious garden: flower beds and terraces round shape
...
Why do round the garden
...
Protein stuck in manhole cover in the city Aysenhagen, northern Germany.
...
Miraculously survived: in lobovuhu hatch flew ...!
...
Unconscious ask the right questions
...
Byzantine iPad found by archaeologists in Bosphorus
...
Underground station in Spanish logroño
...
Microloans without restrictions
...
A trick question on interview
 Cheryomushki - SSHHPP  Fortieth Anniversary of several films of the USSR