public class Rectangle implements Shape {

	private double width;
	private double length;


	public Rectangle(double width, double length)
		 throws DimensionException,
			IllegalArgumentException 
			 {

		if(width > length)
		  throw new DimensionException(length, width);
		if(width <=0 || length <=0)
		   throw new IllegalArgumentException();


		this.length = length;
		this.width = width;
	}


	public double perimeter() {

		return 2 * (length + width);
	}

	public double area() {
		return length * width;


	}

}