using System;

public class Program

{

    public static void Main()

    {

        Rectangle r = new Rectangle(10.0, 20.0);

        double area = r.GetArea();

        Console.WriteLine("The area of the rectangle is " + area + ".");

        r.funFact();

    }

    class Rectangle{

        private double length;

        private double width;

        public Rectangle(double l, double w){

            length = l;

            width = w;

        }

        public double GetArea(){

            return length * width;

        }

        public void funFact(){

            Console.WriteLine("Did you know that all squares are rectangles but not all rectangles are squares.");

        }

    }

}