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)

'use strict';
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');