using System;

public class Program

{

    public static void Main()

    {

         Retangulo r = new Retangulo();

         double b = Convert.ToDouble(Console.ReadLine());

         double a = Convert.ToDouble(Console.ReadLine());

         Console.WriteLine("Área do Retângulo");

         Console.WriteLine(r.calcularArea(b, a).ToString());

        Console.WriteLine("Perímetro");

         Console.WriteLine(r.calcularPerimetro(b, a).ToString());

    }

}

​

public class Retangulo

{   

   double basinha;

   double alturinha;

   public double calcularArea(double b, double a)   {

      return b*a;

   }

    public double calcularPerimetro(double b, double a )    {

      return 2*b+2*a;

   }

}

​

​