Area_of_Figures

using System;


namespace Area_of_Figures
{
    class Program
    {
        static void Main()
        {
            Console.WriteLine("Enter your chois: square, rectangle, circle or triangle");

            string chois = (Console.ReadLine());

            if (chois == "square")
            {
                var num1 = double.Parse(Console.ReadLine());
                var squareResult = num1 * num1;
                Console.WriteLine("{0}", squareResult);
            }
            else if(chois =="rectangle")
            {
                var num1 = double.Parse(Console.ReadLine());
                var num2 = double.Parse(Console.ReadLine());
                var rectResult = num1 * num2;
                Console.WriteLine("{0}", rectResult);
            }
            else if (chois == "circle")
            {
                var num1 = double.Parse(Console.ReadLine());
                var cirResult = (Math.PI*(num1*num1));
                Console.WriteLine("{0:f3}", cirResult);
            }
            else if (chois == "triangle")
            {
                var num1 = double.Parse(Console.ReadLine());
                var num2 = double.Parse(Console.ReadLine());
                var triResult =((num1*num2)/2);
                Console.WriteLine("{0}", triResult);
            }
        }
    }
}