using System;

using System.Collections.Generic;

​

namespace ConsoleApp30

{ 

    interface IShape

    {

        void Paragic();

        void Makeres();

    }

​

    class Uxankyun:IShape

    {

        public void Paragic()

        {

            Console.WriteLine("(a+b)*2");

        }

        public void Makeres()

        {

            Console.WriteLine("a*b");

        }

    }

​

    class Shrjanagic:IShape

    {

        public void Paragic()

        {

            Console.WriteLine("2*pi*r");

        }

        public void Makeres()

        {

            Console.WriteLine("pi*r^2");

        }

    }

    class Programn

    {

        static void Main(string[] args)

        {

            List<IShape> a = new List<IShape>();

​

            a.Add(new Uxankyun());

            a.Add(new Shrjanagic());

​

            foreach (IShape item in a)

            {

                Console.WriteLine();

                item.Paragic();

                item.Makeres();

            }

        }

    }

}

​