30 inches - The circumference of a Basketball varies according to the governing organization's rules. According to the FIBA, it is 78 cm (30.7"). In the NBA, it is 29 1/2" to 29 3/4" around the channels and 29 5/8" to 29 7/8" across the channels. In the NCAA the maximum Circumference is 30".
The NBA also recommends these sizes for different athletes
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A circumference is 4
25.13 feet is the circumference. (diameter x pi = circumference).
The circumference is the distance around a closed curve. Circumference is a special perimeter.
circumference = pi*diameter or pi = circumference/diameter
Circumference is a noun.