public class Rectangle implements Shape {
	private double length;
	private double width;
	
	public Rectangle(double length, double width) {
		this.length = length;
		this.width = width;
	}
	
	public double perimeter() {
		return 2 * length + 2 * width;
	}
	
	public double area() {
		return length * width;
	}
}