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 JavaScript (judge verdict: Accepted)

process.stdin.setEncoding('utf-8');
process.stdin.on('data', (input) => {
  var arry = input.split(' ').map(Number);
  var r = arry[0];
  var a = r * r * Math.PI;
  var b = 2 * r * Math.PI;

  var output = a.toFixed(5) + ' ' + b.toFixed(5)

  console.log(output);
})