using System;

​

public class Triangulo

{

    private int base_;

    private int altura;

​

    //constructor

    public Triangulo(int base_, int altura) 

    {

        this.base_ = base_;

        this.altura = altura;

    }

    //properties

    public int Base_

    {

        get{return base_;}  

        set {base_ = value;}

    }

     //properties

    public int Altura 

    {

        get{return altura;}

        set{altura = value;}

    }

     //properties

    public int Area

    {

        get{return base_* altura/2;}

    }   

}   

​

public class PrintValue

{

    public static void Main()

    {

        Triangulo greetings = new Triangulo( 10 , 5);

        greetings.Base_ = 20;

        int answer = greetings.Base_;

        Console.WriteLine("{0}",answer);

        Console.ReadLine();

    }

}