using System;

public class Program

{

public abstract class FiguraGeometrica

​

{

​

    public string Nombre { get; set; }

​

    public abstract double CalcularPerimetro();

​

    public abstract double CalcularArea();

​

}

​

public class Cuadrado : FiguraGeometrica

​

{

​

    public double Lado { get; set; }

​

    public override double CalcularPerimetro()

​

    {

​

        return 4 * Lado;

​

    }

​

    public override double CalcularArea()

​

    {

​

        return Lado * Lado;

​

    }

​

}