Trapezoids

using System;

class Trapezoids
{
    static void Main()
    {
        Console.Write("a = ");
        double a = double.Parse(Console.ReadLine());
        Console.Write("b = ");
        double b = double.Parse(Console.ReadLine());
        Console.Write("h = ");
        double h = double.Parse(Console.ReadLine());

        double area = ((a + b) / 2) * h;

        Console.WriteLine("Area of trapezoid is " + area);
    }
}