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 Kotlin (judge verdict: Accepted)

import java.lang.Math.*

fun main(args: Array<String>) {
    val r = readLine()!!.toDouble()

    val area = PI * pow(r, 2.toDouble())
    val circumference = 2 * PI * r

    println("%f %f".format(area, circumference))
}