using System;

namespace oopite300

{

  public class Circle

  {

    public static int Main(string[] args)

    {

      System.Console.WriteLine("Please Enter the radius of a circle");

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

      System.Console.WriteLine("The area of a circle is: " + getArea(radius));

      System.Console.WriteLine("The circumference of the circle is: " + getCircumference(radius));

      return 0;

    }

    public static double getArea(double radius){

      return 3.1415926535898 * radius * radius; 

    }

    public static double getCircumference(double radius){

      return 2 * 3.1415926535898 * radius;

    }

  }

}