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.Scanner;
import java.io.IOException;

class Main {
	public static void main(String[] args) throws IOException {
		Scanner scan = new Scanner(System.in);
		double r = scan.nextDouble();
		String a = String.format("%.5f", r * r * Math.PI);
		String b = String.format("%.5f", (r * 2) * Math.PI);
		System.out.println(a + " " + b);
	}
}