using System;

namespace DeclaringCOnstants {

     public class Program {

        public static void Main (string[]args) {

            const double pi = 3.14159;

            //constant declaration

            double r;

            Console.WriteLine("Enter Radius:");

            r=Convert.ToDouble(Console.ReadLine());

            double areaCircle = pi * r * r;

            double perimetri = 2 * pi * r;

            Console.WriteLine("Radius: {0}, Area {1}, Perimetri {2}", r, areaCircle,perimetri);

            Console.ReadLine();

        }

    }

}