The invention of Basketball is pretty basic. A football coach was looking for a way to keep his players in shape, so he nailed a peach basket to a tall post. He told his players to get the ball in the basket and prevent the other players from doing so. It just made most sense to make the ball circular so that it could be shot into the basket.
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Because it allows the ball to be aerodynamic, and this lets it fly through the air more easily (less wind resistance and friction), and to fly farther.
If a volleyball was not round, the bounce would be affected. If a volleyball were oblong, it wouldn't bounce correctly and the direction of the bounce would be hard to control.
so they are easier to throw and can spiral through the air i think i would look it up
The ball in American football is ovoid shaped so that it may be held easily in the hand and hugged to the body. Also the shape of the ball means that it is more aerodynamic when it is thrown.