using System;

public class Program

{

    public static void Main()

    {

         string line;

            double x, y, z, Triangle, Circle,Trapezium, Square, Rectangle, pi = 3.14159;

            line = Console.ReadLine();

            x = Convert.ToDouble(line.Split(' ')[0]);

            y = Convert.ToDouble(line.Split(' ')[1]);

            z = Convert.ToDouble(line.Split(' ')[2]);

            Triangle = 0.5 * x * z;

            Circle = pi * Math.Pow(z, 2);

            Trapezium = ((x + y) / 2) * z;

            Square = Math.Pow(y, 2);

            Rectangle = x * y;

​

            Console.WriteLine("TRIANGULO: " + Triangle.ToString("f3"));

            Console.WriteLine("CIRCULO: " + Circle.ToString("f3"));

            Console.WriteLine("TRAPEZIO: " + Trapezium.ToString("f3"));

            Console.WriteLine("QUADRADO: " + Square.ToString("f3"));

            Console.WriteLine("RETANGULO: " + Rectangle.ToString("f3"));

​

            Console.ReadKey();

    }

}