using System;

using System.IO;

public class Program

{

    public class Shape

    {

        protected int width;

        protected int height;

        public Shape(int h, int w)

        {

            width= w;

            height = h;

        }

        public virtual void Area()

        {

            Console.WriteLine("Parent Class Area");

        }

    }

    public class Rectangle : Shape

    {

        public Rectangle(int a, int b): base(a,b){}

        public override void Area()

        {

            int area = width*height;

            Console.WriteLine("Area of rectangle " + area );

        }

    }

    public class Triangle : Shape

    {

        public Triangle(int a, int b): base(a,b){}

        public override void Area()

        {

            int area = width*height;

            Console.WriteLine("Area of triangle "+ area);

        }

    }

    public static void Main()

    {

        Rectangle R = new Rectangle(5,6);

        Triangle T =  new Triangle(8,10);

        R.Area();

        T.Area();

    }

}