public static void Main()
Console.WriteLine("Menghitung Luas dan Keliling Lingkaran");
Console.WriteLine("1.Luas");
Console.WriteLine("2.Keliling");
Console.WriteLine("Pilih (1/2):");
Pilihan =float.Parse(Console.ReadLine());
Console.Write("Radius:");
Radius = float.Parse(Console.ReadLine());
Console.WriteLine("Luas:{0}",3.14*Radius*Radius);
Console.WriteLine("Keliling:{0}",3.14*(Radius+Radius));