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;

class Main{
    public static void main(String args[]){

        Scanner sc = new Scanner(System.in);
        double  r  = sc.nextDouble();
        sc.close();
        
        double pi = Math.PI;
        double ci = 2*pi*r;
        double ar = pi*Math.pow(r,2);

        String circ = BigDecimal.valueOf(ci).toPlainString();
        String area = BigDecimal.valueOf(ar).toPlainString();
        
        System.out.println(new StringBuilder()
            .append(area).append(" ")
            .append(circ));
    }
}