static void Main(string[] args)
{
shape c = new circle(9);
c.area();
Console.ReadKey();
}
static void Main(string[] args)
{
circle C = new circle(14.0);
Console.WriteLine("Luas Lingkaran \t\t= {0}", C.area());
rectangle K = new rectangle(18.0);
Console.WriteLine("Luas Persegi \t\t= {0}", K.area());
TriAngle S = new TriAngle(18.0, 5.0);
Console.WriteLine("Luas Segitiga \t\t= {0}", S.area());
}
