using System;

​

namespace ConsoleApp28

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Insert Radius");

            double radius = Double.Parse(Console.ReadLine());

            Console.WriteLine(Circle.Perimeter(radius));

            Console.WriteLine(Circle.Face(radius));

            Console.WriteLine(Sphere.Surface(radius));

            Console.WriteLine(Sphere.Volume(radius));

        }

    }

    static class Circle

    {

        static private double pi = 3.1416;

        static public double Perimeter(double R)

        { return 2 * pi * R; }

        static public double Face(double R)

        {

            return pi * R * R;

        }

    }

    static class Sphere

    {

        static private double pi = 3.1416;

        static public double Surface(double R)

        {

            return 4 * pi * R * R;

        }

        static public double Volume(double R)

        { return 4 * pi * R * R * R / 3; }

​

    }

}