private static void DisplayPolygon(string shape, dynamic obj)
        {
            int numberOfSides = obj.NumberOfSides;
            int sideLength = obj.SideLength;
            double perimiter = obj.GetPerimiter();
            double area = obj.GetArea();

            Console.WriteLine("{0} number of sides: {1}",shape, numberOfSides);
            Console.WriteLine("{0} side Length: {1}", shape, sideLength);
            Console.WriteLine("{0} perimiter: {1}", shape, perimiter);
            Console.WriteLine("{0} area: {1}", shape, area);
        }