Quote:
Originally Posted by Taltarzac725
1. Easier to put a round cover on a round hole.
2. Easier to move a wheel shaped object.
3. Least area so less cost in metal and less weight.
4. Shape that does not fall into hole even though it has wider rim than hole.
5. Who cares?
6. Easier for Hulk to throw at invading aliens like frisbee.
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Shape that does not fall into hole even though it has wider rim than hole. A square cover would fit easily through a square hole...and man-o-man, would that thing hurt if it hit you on the head!