public class Rectangle extends Shape
{
	private double width, height;
	
	public Rectangle(double upperLeftX, double upperLeftY, double w, double h) {
		super(upperLeftX + w/2, upperLeftY + h/2);
		width = w;
		height = h;
	}
	
	public double area() {
		return width * height;
	}
	
	public double perimeter() {
		return 2*(width + height);
	}
	
	public int numberOfSides() {
		return 4;
	}
	
	public boolean isGolden() {
		
		double ratioOfSides = Math.abs(Math.max(width, height) / Math.min(width, height));
		return  (ratioOfSides - 0.5*(1 + Math.sqrt(5))) < 0.001;
	}
}