using System;

using System.Collections.Generic;

using System.Text;



namespace lektion8_uppgift2

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.Write("Ange cirkelns radie: ");

            double r = ReadDouble();



            double area = GetCircleArea(r);



            Console.WriteLine();

            Console.WriteLine("Cirkelns area: " + area);



            Console.ReadKey();



        }



        static double GetCircleArea(double radie)

        {

            double pi = 3.14159;

            double area = pi * radie * radie;

            return area;

        }



        static double ReadDouble()

        {

            double tal = double.Parse(Console.ReadLine());

            return tal;

        }

    }

}