Figure Areas

using System;

public class Program
{
	public static void Main()
	{
        {
            var figure = (Console.ReadLine());
            var area = 0.0;

            if (figure == "square")
            {
                var sideofSquare = double.Parse(Console.ReadLine());
                area = sideofSquare * sideofSquare;
                Console.WriteLine(Math.Round(area, 3));
            }
            else if (figure == "rectangle")
            {
                var sideOne = double.Parse(Console.ReadLine());
                var sideTwo = double.Parse(Console.ReadLine());
                area = sideOne * sideTwo;
                Console.WriteLine(Math.Round(area,3));
            }
            else if (figure == "circle")
            {
                var r = double.Parse(Console.ReadLine());
                area = r * r * Math.PI;
                Console.WriteLine(Math.Round(area, 3));
            }
            else if (figure == "triangle")
            {
                var side = double.Parse(Console.ReadLine());
                var hight = double.Parse(Console.ReadLine());
                area = side * hight / 2;
                Console.WriteLine(Math.Round(area, 3));
            }

        }
    }
}