Usando el switch en C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Figuras
{
    class Program
    {
        static void Main(string[] args)
        {
           
            Double radio;
            Int32 basse;
            Int32 altura;
            Int32 opcion;
            Console.Clear();
            Console.WriteLine("1.- Area de triangulo: ");
            Console.WriteLine("2.- Area de cuadrado: ");
            Console.WriteLine("3.- Area de circulo: ");
            Console.WriteLine("4.- Area de rectangulo: ");

            Console.WriteLine("   Elija una opción: ");
            opcion = Convert.ToInt32(Console.ReadLine());
         
          
           
            switch (opcion)
            {
                case 1:
                    Console.Clear();
                    Console.WriteLine("Inserte base: ");
                    basse = Convert.ToInt32(Console.ReadLine());

                    Console.WriteLine("Inserte altura: ");
                    altura = Convert.ToInt32(Console.ReadLine());
                    Console.WriteLine("El area es: "+((basse*altura)/2));
                    break;
              
                case 2:
                    Console.Clear();
                  

                    Console.WriteLine("Inserte altura: ");
                    altura = Convert.ToInt32(Console.ReadLine());
                    Console.WriteLine("El area es: "+((altura*altura)));
                    break;
                case 3:
                    Console.Clear();
                    Console.WriteLine("Inserte radio: ");
                    radio = Convert.ToDouble(Console.ReadLine());
                   
                    Console.WriteLine("El area es: " +(radio *radio* 3.1416));
                    break;
                case 4:
                    Console.Clear();
                    Console.WriteLine("Inserte altura: ");
                    altura = Convert.ToInt32(Console.ReadLine());
                    Console.WriteLine("Inserte altura: ");
                    basse = Convert.ToInt32(Console.ReadLine());
                   
                    Console.WriteLine("El area es: "+((basse*altura)));
                    break;
            }

            Console.ReadLine();
        }
    }
}
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