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Define the Sphere class. Include a
radius instance variable, with a setter and getter. Then, use the
setter and getter to define a volume method for instances of the
Sphere class.
Next, alter the class definition such that the instance variable is
diameter, rather than radius. Write a getter and setter for
the diameter variable. Write a getter and setter for the radius
derived attribute. Check your volume method to be
sure that it still provides correct answers, without change, even though the
detailed representation for sphere instances has changed.