using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

namespace Rextester

{

    public interface geo

    {

        double arie();

        double perimetru();

        string nume

        {

            get;

        }

    }

​

    public class cerc : geo

    {

        string n = "cerc";

        double r;

        public string nume

        {

            get

            {

                return n;

            }

        }

​

        public cerc(double x)

        {

            r = x;

        }

​

        public double arie()

        {

            return r * r * System.Math.PI;

        }

​

        public double perimetru()

        {

            return 2 * r * System.Math.PI;

        }

    }

​

    public class patrat : geo

    {

        double l;

        string n = "patrat";

        public string nume

        {

            get

            {

                return n;

            }

        }

​

        public double arie()

        {

            return l * l;

        }

​

        public patrat(double x)

        {

            l = x;

        }

​

        public double perimetru()

        {

            return 4 * l;

        }

    }

​

    public class Program

    {

        static void print(geo I)

        {

            Console.WriteLine("Perimetru {2}: {0:#.##}   Arie {2}:{1:#.##}", I.perimetru(), I.arie(), I.nume);

        }

​

        public static void Main(string[] args)

        {

            cerc c;

            patrat p;

            c = new cerc(9);

            p = new patrat(5);

            print(c);

            print(p);

        }

    }

}