using System;
public class Program
{
public static void Main()
double jari2;
jari2 = 9.0;
luaslingkaran(jari2);
keliling(jari2);
}
static void luaslingkaran(double asd){
Console.WriteLine(3.14 * asd * asd);
static void keliling(double zxc){
Console.WriteLine(2 * 3.14 * zxc);