using System;

public class Program

{

    public static void Main()

    {

        /*

        GOAL

        Calculate the area of a given shape (rectangular, triangle or circle) and given parameters.

        It is up to you to figure out what they are and then how to calculate the area.

        TIPS

        Ask the user to first what shape they wish to calculate the area for.

        You can use symbols for instance: R, T, C.

        Then ask for the dimensions of the shape depending on what it is.

        */

        // EXTRA TIP, there is a PI value in Math lib:

        var pi = Math.PI;

        Console.WriteLine("Hi user! :) If you want to calculate the area of a given shape please provide what kind of shape are you interested in.");

        string shape = Console.ReadLine();

        string shape1 = "circus";

        string shape2 = "rectangular";

        if  (shape1 == "circus")

        {

            double radius, area;

            Console.WriteLine("Enter the radius of circle.");

            radius = Convert.ToDouble(Console.ReadLine());

            area = Math.PI * radius * radius;

            Console.WriteLine("Area of the Circle with radius {0} is {1}",radius, area);

        }

​

        else if (shape1 != "circus" || shape2 == "rectangular" )

        {

            double SideA, SideB, RetangleArea;

            Console.WriteLine("State the length of the first side.");

            SideA = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("State the length of the second side.");

            SideB = Convert.ToDouble(Console.ReadLine());

            RetangleArea = Math.Abs(SideA * SideB);

            Console.WriteLine("Area of the rectangular with radius {0} and {1} is {2}",SideA, SideB, RetangleArea);

        }

        else

        {

            double SideA, TriangleArea;

            Console.WriteLine("State the length of the side.");

            SideA = Convert.ToDouble(Console.ReadLine());

            TriangleArea = Math.Abs(SideA * SideA);

            Console.WriteLine("Area of the triangle with radius {0} is {1}",SideA, TriangleArea);

        }       

    }

}