Why are manhole covers round The following answers may be ri

Why are manhole covers round? The following answers may be right, but get no points. Wrong answer 1 - Because man holes are round Wrong answer 2 - Because men (especially middle aged men) are round Wrong answer 3 - Because you can move them by rolling them.

Solution

Circular manhole opening cannot fall through opening.if manhole cover is square shape it may fall through the diagonal of square shaped hole . And for circular shape cover it can place on circular shape hole easily , in case of rectangular shape cover we need to set the shape correctly on rectangular shaped hole, while doing this cover may fall through hole.