Problem:
Circle

Write a program which calculates the area and circumference of a circle for given radius r.

Input

A real number r is given.

Output

Print the area and circumference of the circle in a line. Put a single space between them. The output should not contain an absolute error greater than 10-5.

Constraints

0 < r < 10000

Sample Input 1

2

Sample Output 1

12.566371 12.566371

Sample Input 2

3

Sample Output 2

28.274334 18.849556

Solution in C# (judge verdict: Wrong Answer)

//ITP1_4_B

using System;
using System.Collections.Generic;
/*using System.Linq;
using System.Text;
using System.Threading.Tasks;*/

class Program
{
    static void Main(string[] args)
    {
        //?????????????????????????????????int??????iaaray????????????????????\

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

        double pai = 3.1415926535;
        double s = r * r * pai;
        double c = r * 2.000000 * pai;

        Console.WriteLine(s.ToString("0.000000") + " " + c.ToString("0.000000"));
    }
}