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: Accepted)

using System;

namespace Testcode
{
    class Program
    {
        
        static void Main(string[] args)
        {         
         
                string[] d = Console.ReadLine().Split();
                var a = double.Parse(d[0]);
                double pi = Math.PI;

            Console.WriteLine((pi * a * a) + " " + (2 * pi * a));

            
        }
       
    }
}