using System;

public class Program

{

    public static void Main()

    {

    }

    class Rectangle{

        //instance variables/data fields/properties

        private double length;

        private double width;

        //constructor

        public Rectangle(double l, double w){

            length = l;

            width = w;

        }

        //return type method

        public double GetArea(){

            return length * width;

        }

        //void method

        public void FunFact(){

            Console.WriteLine("Did you know all squares are rectangles, but not all rectangles are squares? Thanks Geometry!");

        }

    }

}