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 JAVA (judge verdict: Accepted)

import java.util.*;
import java.io.*;

public class Main{
 public static void main(String[] args) throws IOException
 {
   Scanner sc = new Scanner(System.in);
   InputStreamReader is = new InputStreamReader(System.in);
   BufferedReader br = new BufferedReader(is);
   
   String inStr = br.readLine();
   double r = Double.parseDouble(inStr);
 
    System.out.printf("%.6f", r*r*Math.PI);
    System.out.print(" ");
    System.out.printf("%.6f", 2*r*Math.PI);
    System.out.println("");
 }
}