using System;

namespace ConsoleApp1
{

    public class Bod2D
    {

        public int x { get; set; }
        public int y { get; set; }

        public override string ToString()
        {
            return $"x={x} y={y}";
        }
        public Bod2D(int x, int y)
        {

            this.x = x;
            this.y = y;
        }
    }


    public class Kruh
    {

        public Bod2D bod { get; set; }
        public int r { get; set; }

        public Kruh(Bod2D bod, int r)
        {
            this.bod = bod;
            this.r = r;

        }

        public double V { get; set; }
        public void VratObvod()
        {
            double V = 2 * Math.PI * r;
            bod.x = 5;

        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Bod2D bod = new Bod2D(2, 3);
            Kruh kruh = new Kruh(bod, 10);
            //Console.WriteLine(kruh.bod.x + " " +kruh.bod.y);

            kruh.VratObvod();
            Console.WriteLine(kruh.V);
            Console.ReadKey();

        }
    }

}