Strategic Statement: This classical Microsoft question which is designed for you to think quickly and clearly. Think of AT LEAST one reason/one answer, and support it.

Sample Response:

Manhole covers are heavy... too heavy for most people to be able to pick up and move. They are round so that they can be rolled away from the manhole.

Another reason might be the possibility of cover falling to the the manhole. Round cover would never fall into the hole, while square of rectangular shaped covers could.

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