Java - JavaApplication30 Circle.java

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package javaapplication30;

/**
 *
 * @author fmi
 */
public class Circle extends Figure {

    private double r;

    public static final double PI=3.14;

    public Circle(double r){
        this.r = r;
    }

    @Override
    public double calculatePerimeter(){
        return 2*Circle.PI*r;
    }
}