Example 2
  1. Determine the radius of the basketball, to the nearest tenth of an inch.

  2. What is the diameter of the basketball?

  3. Is this a regulation basketball for the NBA?






  1. The radius of the basketball is approximately 4.8 inches.

  2. The diameter is


  3. Research on the Internet indicates that this basketball, with diameter 9.6 inches, is very close to a regulation basketball for the NBA. There are some websites, however, that state regulation basketballs have a diameter closer to 9.4 inches.





For an example of how to determine the radius of a sphere when the volume is known, see p. 84 of Mathematics 10.