using System;

​

namespace polyphormism

{

    public class Program

    {

        public static void Main(string[] args)

        {

            Console.Write("Please enter the length of the Rectangle: ");

            double l = double.Parse(Console.ReadLine());

            Console.Write("Please enter the width of the Rectangle: ");

            double w = double.Parse(Console.ReadLine());

​

            Rectangle myRectangle = new Rectangle(l, w);

            Console.WriteLine("The area of the Rectangle is " + myRectangle.GetArea());

​

            Console.Write("Now, please input the base of the triangle: ");

            double b = double.Parse(Console.ReadLine());

            Console.Write("Now, please input the height of the triangle: ");

            double h = double.Parse(Console.ReadLine());

​

            Triangle myTri = new Triangle(b , h);

            Console.WriteLine("The area of the Trianggle is " + myTri.GetArea());

​

​

        }

        abstract class Shape

        {

        public abstract double GetArea();

        }

        class Rectangle : Shape

        {

        public double tlength;

        public double twidth;

​

        public Rectangle(double l, double w)

        {

            tlength = l;

            twidth = w;

        }

​

        public override double GetArea()

        {

            double areaRectangle = tlength * twidth;

            return areaRectangle;

        }

        }

        class Triangle : Shape

    {

        public double tbase;

        public double theight;

​

        public Triangle(double r, double h)

        {

            tbase = r;

            theight = h;

        }

​

        public override double GetArea()

        {

            double areaTriangle = (tbase * theight)/2; 

            return areaTriangle;

        }

    }

    }

}