using System;

​

public class Program

{

    // Problem 1 (Rectangle Problem).

    public static int GetAreaFromRectangle(int length, int width)

    {

        int perimeter = -1;

        // YOUR CHANGES GO HERE.

        return perimeter;

    }

    // Sum of all the sides.

    public static int GetPerimeterFromRectangle(int length, int width)

    {

        int perimeter = -1;

        // YOUR CHANGES GO HERE.

        return perimeter;

    }

    // Problem 2 (Centered Triangle Problem).

    public static string PrintAlphabetTriangle(char Symbol)

    {

        string triangle = "";

        // YOUR CHANGES GO HERE.

        return triangle;

    }

    public static void Main()

    {

        // Test case for problem 1.

        Console.WriteLine("Rectangle Problem Area: " + (800 == GetAreaFromRectangle(20, 40)));

        Console.WriteLine("Rectangle Problem Perimeter: " + (120 == GetPerimeterFromRectangle(20, 40)));

        Console.WriteLine("-------------------------------------------------------------");

        // Test case for problem 2.

        string triangle = PrintAlphabetTriangle('*');

        Console.WriteLine(triangle);

        string triangle2 = @"     *

    ***

   *****

  *******

 *********" + "\n";

        Console.WriteLine("Centered Triangle Problem: " + (triangle.Equals(triangle2)));

    }

}