1010: 求圆的周长和面积
import java.util.*;
public class Main {
public static void main(String[] args) {
double Pi=3.14159;Scanner cin = new Scanner(System.in);double r=cin.nextDouble();double l=2*Pi*r;double s=Pi*r*r;System.out.println(String.format("%.2f %.2f",l,s));}
}