A sphere is the natural shape for maleable objects to assume when manipulated. It is the shape with the lowest surface area per unit volume and is thus lowest in energy. That is why drops of water eventually become spheres when suspended in zero gravity.
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Basketballs are sphere in shape because they need to be bounced at any time on anywhere. For example, if a Basketball was square in shape, it wouldn't bounce would it! If a basketball is round and round, then any part of it would be able to bounce on a surface. Basketballs are also sphere so that they can fit nice and smooth in your hands. When they fit nice and smooth in your hands, it is therefore easier to throw them around and shoot.
it moves throw the air and ground easier, faster, and quicker. It is all to do with air-resistances and friction.
It is approximately spherical, not exactly. A spherical shape gives it a straighter flight and bounce.
As sphere has no edges and no corners, so it will hurt if it hits on our body