using System;

​

namespace Constructores

{

    public class area

    {

        public double B;

        public double b;

        public double H;

        public area(double a, double b, double h)

        {

            this.B = b;

            this.b = B;

            this.H = h;

        }

        public double areatrapecio()

        {

            double areadeltrapecio;

            areadeltrapecio = (B + b) / 2 * H;

            return areadeltrapecio;

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Escribe el valor de B");

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

            Console.WriteLine("Escribe el valor de b");

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

            Console.WriteLine("Escribe el valor de H");

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

            area areatrapecio1 = new area(B, b, h);

            double areat = areatrapecio1.areatrapecio();

            Console.WriteLine(areat);

        }

    }

}

​