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.math.BigDecimal;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		BigDecimal a = BigDecimal.valueOf(sc.nextDouble());
		BigDecimal rate = BigDecimal.valueOf(Math.PI);
		
		BigDecimal beforeArea = a.multiply(a).multiply(rate);
		BigDecimal beforeLength = a.multiply(BigDecimal.valueOf(2.0)).multiply(rate);
		
		String afterArea = String.format("%.6f",beforeArea);
		String afterLength = String.format("%.6f",beforeLength);
		
		System.out.println(afterArea + " " + afterLength);
	}

}