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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 *
 */

/**
 * @author cthanh
 *
 */
public class Main {

	/**
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		// TODO ?????????????????????????????????????????????
		 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));// ??\?????????
		    String str = br.readLine();
		    double r =  Double.parseDouble(str);
		    double men = (double) r *r *Math.PI;
		    double syu = (double) r*2* Math.PI;
		   // System.out.println(Math.PI);
		    System.out.printf( "%.6f %.6f",men , syu );


	}

}