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;
public class Main {
public static void main(String[] args){
		
		{
	       
	         double r;
	         Scanner sc = new Scanner(System.in);
	         
		     
	 		r = sc.nextDouble();
	 		
	 		
	 		double d=r*r*Math.PI;
	 		double t=2*r*Math.PI;
	 		 System.out.printf("%.6f",d);
	 		 System.out.print(" ");
	 		 System.out.printf("%.6f",t);
	 		 
	         sc.close();
}}}