2. Complete the circumference() method of the Circle class. public class Circle { private double radius;...

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2. Complete the circumference() method of the Circle class. public class Circle { private double radius; // constructor // postcondition: the instance variable is initialized public Circle(double rad) radius = rad; (2 points) 2. Complete the circumference() method of the Circle class. public class Circle { private double radius; // constructor // postcondition: the instance variable is initialized public Circle(double rad) radius = rad; (2 points)