public class Square extends Rectangle {

	// Constructors:
	public Square(double width) {
		super.setWidth(width);
		super.setHeight(width);
	}
	public Square() { }	
	
	// Encapsulate the instance variable:
	public void setWidth(double width) {
		super.setWidth(width);
		super.setHeight(width);
	}
	
}