// A Circle IS-A Shape, that is, it is the same as a Shape except...
public class Circle extends Shape {
	private double radius;

	// OVERRIDE getArea() method in our superclass
	public double getArea(){ 
		double area;
		area=Math.PI*radius*radius;
		return(area);
	}

	// OVERRIDE getPerimeter() method in out superclass
	public double getPerimeter(){ 
		double perimeter;
		perimeter=Math.PI*2*radius;
		return(perimeter);
	}

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