The National Basketball Association allows only one official ball: The ball must be the official NBA game ball manufactured by Spalding. The ball is orange in colour, 29.5 (749 mm) inches in circumference and weighs 22 ounces (624 g) (size 7). It must also be inflated to between 7.5 and 8.5 pounds per square inch.
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29.5" is what the N.B.A. uses. the women use a 28.5"
29.5 inches is NOT the diameter of a standard basketball. It is the circumference. The circumference is the diameter multiplied by pi (approximately 3.14). The diameter would therefore be 29.5/3.14 which equals approximately 9.4 inches.
A men's basketball has a radius of 19.3cm (7.5in) and a circumference of 76cm (30in).
The average diameter of a standard issue basketball from the NBA is 29.5 inches. This gives it an inner diameter on average of 18 inches.
The diameter of an NCAA (and NBA) basketball is approximately 9 inches (22.86 cm). This is a size 7 basketball.
Hoop diameter according to your statement above is 18" inches and
ball diameter is 29.5" inches
Your proof reader was asleep that after noon.