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;
import java.text.DecimalFormat;

public class Main {
	public static void main(String[] args)throws IOException{
		InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        double f , x , h;
        	String list = br.readLine();
        	x = Double.parseDouble(list);
        	DecimalFormat df = new DecimalFormat("0.000000");
        	f = x * x * Math.PI;
        	h = 2 * x * Math.PI;
            System.out.println(df.format(f) + " " + df.format(h));
	}

}