There are two reasons for this: * Firstly, a spherical ball will bounce more predictably. Some games use non-spherical balls (such as American Football or Rugby) and part of the game is the non-predictability of the bounce. * The other thing is that if you inflate anything it will tend to form a sphere; with a sphere the pressure inside the ball is equal throughout the inside of the ball - this is why when bubbles are blown, the are always spheres. It isn't that a ball is round. It's that we call a round thing a ball (or sphere).
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Balls are round because they are more or less aerodynamic and they do not kill you if you are hit by one.
oranges, Earth, Grapefruit, baseballs, soccer balls,beach ball,marbles,tires, apples, ball, spears, 39 straws.
American footballs and Rugby balls are both considered 'balls' but neither are spheres.
about 144 ping pong balls are in a gross.
If you draw enough balls, without replacement, the probability is 1.The answer depends onhow many balls are drawn, andwhether or not they are replaced.Unfortunately, your question gives no information on these matters.
There are 18 Green balls and 12 Blue balls. You have to pick 2 blue balls, so the green balls don't matter. You can pick 1 blue ball on 12 ways. The second ball you can pick on 11 ways (because there are 11 balls left). 12 * 11 = 132. So you can pick it on 132 ways. ;)