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){
Scanner sc=new Scanner(System.in);
double r;
r=sc.nextDouble();
double f,n;
f=Math.PI*r*r;
n=Math.PI*2*r;
System.out.format("%.6f",f);
System.out.print(" ");
System.out.format("%.6f", n);
sc.close();
}
}