public class Rectangle implements TwoDShape  {
    private double width, height;

    public Rectangle (double width, double height) {
        this.width = width;
        this.height = height;
    }

    public double area() {
        return width*height;
    }

    public double perimeter() {
        return 2.0*(width+height);
    }

    public void describe() {
        System.out.print("Rectangle[width=");
        System.out.print(width);
        System.out.print(",height=");
        System.out.print(height);
        System.out.println("]");
    }

}