find the surface area of a pyramid in csharp

main.cs
using System;

class Pyramid
{
    static void Main(string[] args)
    {
        double length, width, height, slantHeight, baseArea, surfaceArea;

        Console.WriteLine("Enter length of base: ");
        length = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter width of base: ");
        width = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter height of pyramid: ");
        height = double.Parse(Console.ReadLine());

        // Calculate the slant height
        slantHeight = Math.Sqrt(Math.Pow(length/2, 2) + Math.Pow(height, 2));

        // Calculate the base area
        baseArea = length * width;

        // Calculate the surface area
        surfaceArea = (0.5 * (length + width) * slantHeight) + baseArea;

        Console.WriteLine("Surface Area of Pyramid: {0}", surfaceArea);
    }
}
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