public static void Main()
string[] dados = Console.ReadLine().Split(' ');
A = Convert.ToDouble(dados[0]);
B = Convert.ToDouble(dados[1]);
C = Convert.ToDouble(dados[2]);
Console.WriteLine("TRIANGULO: "+((A*C)/2).ToString("0.000"));
Console.WriteLine("CIRCULO: "+ (3.14159 * (Math.Pow(C,2))).ToString("0.000"));
Console.WriteLine("TRAPEZIO: "+((0.5*C)*(A+B)).ToString("0.000"));
Console.WriteLine("TRIANGULO: "+((A*C)/2).ToString("0.000"));
Console.WriteLine("TRIANGULO: "+((A*C)/2).ToString("0.000"));