Best Answer

Answer #1:

A standard size Basketball will be approximately 9 inches (22.86 centimeters) in diameter. It will measure approximately 30 inches (76 centimeters) in circumference and will be made out of leather with a hollow air-filled bladder inside the interior.

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Answer #2:

In the NBA and NCAA, the official ball for men's competition is 29.5 inches in

circumference (size 7, or a "295 ball") and weighs 22 oz. If women are playing,

the official basketball size is 28.5 inches in circumference (size 6, or a "285 ball")

with a weight of 20 oz.

Diameter = Circumference/pi

Fora 295 ball, D = 9.39 inches (rounded)

For a 285 ball, D = 9.07 inches (rounded)

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The diameter of an NCAA (and NBA) basketball is approximately 9 inches (22.86 cm). This is a size 7 basketball.

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