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As of 2008 the circumference of a regulation size baseball is between nine and nine and a quarter inches which converts to between about 7.3 cm and 7.5 cm in diameter according to the official rules of Major League Baseball (MLB).
A basketball is a spherical inflated ball used in a game of basketball. Basketballs typically range in size from very small promotional items only a few inches in diameter to extra large balls nearly a foot in diameter used in training exercises. For example, a basketball in high school would be about 27 inches, while an NBA ball would be about 29 inches. The actual standard size of a basketball in the NBA is 9.5 to 9.85 inches (24.1 to 25.0 cm) in diameter. Aside from the court and the baskets, the basketball is the only piece of equipment necessary to play the game of basketball.