Manhole covers are round because they are the strongest shape that can withstand the weight of vehicles and pedestrians. A square or triangular manhole cover could easily be flipped over or broken, which could cause serious injuries or damage. Round manhole covers are also easier to grip and lift, which makes them safer for workers to use.

Here are some additional details about why manhole covers are round:

Round shapes are the strongest shape. This is because there are no weak points or edges that can be easily broken.
Round shapes are easier to grip and lift. This is because there is no need to find a specific point of contact, like with a square or triangular shape.
Round shapes are less likely to get stuck. This is because they can roll freely, which helps to prevent them from getting caught on objects or edges.
Overall, the round shape of manhole covers makes them the safest and most practical option for use in public areas.
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