//Circle.java

/** 
 * A class of circles.
 */
public class Circle
    implements Measurable
{
    private double myRadius;

    public Circle
    (
        double radius
    )
    {
        myRadius = radius;
    }

    public double getPerimeter()
    {
        return 2 * Math.PI * myRadius;
    }

    public double getCircumference()
    {
        return getPerimeter();
    }

    public double getArea()
    {
        return Math.PI * myRadius * myRadius;
    }
}