Trapezoids

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

//Write an expression that calculates trapezoid's area by given sides a and b and height h.
// A = ((a+b)/2)*h

class Trapezoids
{
    static void Main()
    {
        float sideA, sideB, trapHeight;

        Console.WriteLine("Please, enter trapez side a:");
        while (!float.TryParse(Console.ReadLine(), out sideA))
        {
            Console.WriteLine("Please, enter valid integer.");
        }
        Console.WriteLine("Please, enter trapez side b:");
        while (!float.TryParse(Console.ReadLine(), out sideB))
        {
            Console.WriteLine("Please, enter valid integer.");
        }
        Console.WriteLine("Please, enter trapez height:");
        while (!float.TryParse(Console.ReadLine(), out trapHeight))
        {
            Console.WriteLine("Please, enter valid integer.");
        }

        Console.WriteLine("A = {0}", ((sideA + sideB) / 2) * trapHeight);

        Console.WriteLine("Press any key to exit.");
        Console.ReadKey();
    }
}