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.*;
  public class Main{
    public static void main(String[] args)throws IOException{
      BufferedReader mBufferedReader=new BufferedReader(new InputStreamReader(System.in));
      String str=mBufferedReader.readLine();
      double r=Double.parseDouble(str);
      double pi=3.141592653589;
      double l=2*r*pi;
      double s=r*r*pi;
      System.out.printf("%.8f %.8f%n",s ,l);
   }
}