public class Rectangle extends Parallelogram {

	// Class variable:
	protected final static double rightAngle = Math.PI/2;

	// Constructors:
	public Rectangle(double width, double height) {
		super.setWidth(width); super.setHeight(height);
		super.setAngle(rightAngle);
	}
	public Rectangle(Dimension d) {
		super.setDimension(d); super.setAngle(rightAngle);
	}	
	public Rectangle() { }	
	
	// Encapsulate the instance variables:
	public void setWidth(double width) {
		super.setWidth(width);
		super.setAngle(rightAngle);
	}
	public void setHeight(double height) {
		super.setHeight(height);
		super.setAngle(rightAngle);
	}
	public void setDimension(double width, double height) {
		super.setDimension(width, height);
		super.setAngle(rightAngle);
	}
	public void setDimension(Dimension d) {
		super.setDimension(d);
		super.setAngle(rightAngle);
	}
	
}