using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Obed Hinojosa Enriquez 1E");

        int choice,r,l,w,b,h;

      double area=0;

​

​

​

      Console.Write("Enter 1 for area of circle\n");

      Console.Write("Enter 2 for area of rectangle\n");

      Console.Write("Enter 3 for area of triangle\n");

      Console.Write("Enter your choice : ");

      choice = Convert.ToInt32(Console.ReadLine());

​

      switch(choice)

      {

           case 1:

                 Console.Write("Input radius of the circle : ");

                 r = Convert.ToInt32(Console.ReadLine());

                    area=3.14*r*r;

                 break;

            case 2:

                  Console.Write("Input length  of the rectangle : ");

                  l = Convert.ToInt32(Console.ReadLine());

                  Console.Write("Input  width of the rectangle : ");

                  w = Convert.ToInt32(Console.ReadLine());

                  area=l*w;

                  break;

            case 3:

                  Console.Write("Input the base of the triangle :");

                  b = Convert.ToInt32(Console.ReadLine());

                  Console.Write("Input the hight of the triangle :");

                  h = Convert.ToInt32(Console.ReadLine());

                         area=.5*b*h;

                  break;

          }

          Console.Write("The area is : {0}\n",area);

    }

}