SO that it would be easier to bounce off the ground.
if it's square or triangle, it would be hard to bounce if off the ground..
you could try it by yourself if you don't trust me...
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They are made like that so that they roll for the game soccer. The air particles bounce off the walls, making it easy to keep the air inside the soccer ball.
No. Not all balls are round. American footballs, Rugby footballs and Australian rules footballs are not round but oval.