class sphereClass: public equidistantClass
{
public:
   sphereClass();
   sphereClass(double InitialRadius);
   sphereClass(const sphereClass& S);
   virtual ~sphereClass();

   virtual void SetRadius(double NewRadius);
   virtual double Radius() const;
   virtual double Diameter() const;
   virtual double Circumference() const;
   virtual double Area() const;
   virtual double Volume() const;
   virtual void DisplayStatistics() const;

private:
   double TheRadius;
};  // end class