11. Geometry Calculator

using System;

namespace P11._Geometry_Calculator
{
    class Program
    {
        static void Main(string[] args)
        {
            string figure = Console.ReadLine().ToLower();
            switch (figure)
            {
                case "triangle":
                double side = double.Parse(Console.ReadLine());
                double height = double.Parse(Console.ReadLine());
                GetTriangleArea(side,height);
                break;

                case "square":
                double side1 = double.Parse(Console.ReadLine());
                GetSquareArea(side1);
                break;

                case "rectangle":
                double width  = double.Parse(Console.ReadLine());
                double height1 = double.Parse(Console.ReadLine());
                GetRectangleArea(width,height1);
                break;

                case "Circle":
                double r  = double.Parse(Console.ReadLine());
                GetCircleArea(r);
                break;
            }
        }
        static void GetTriangleArea(double sideA, double heightA)
        {
            double result = sideA * heightA/2;
            System.Console.WriteLine($"{result:f2}");
        }
        static void GetSquareArea(double side)
        {
            double result = side*side;
            System.Console.WriteLine($"{result:f2}");
        }
        static void GetRectangleArea(double width, double height)
        {
            double result = width * height;
            System.Console.WriteLine($"{result:f2}");
        }
        static void GetCircleArea(double radious)
        {
            double result = Math.PI * radious * radious;
            System.Console.WriteLine($"{result:f2}");
        }
    }
}