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;
public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String str =br.readLine();
		String[] stra = str.split(" ");
		
		double a = Double.parseDouble(stra[0]);
		double p = 3.1415926535897932384626433 ;
		System.out.printf("%.8f %.8f",a*a*p,2*p*a);
	}

}