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.on('data', function(chunk) {
  var inputs = chunk.toString().trim();
  var r = Number(inputs);
  console.log(Math.PI * Math.pow(r,2)
,2*Math.PI*r
  	);
  // ????????????????????????
});
process.stdin.resume();
process.stdin.setEncoding('utf8');