Skew Polygon

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\documentclass{article}
\usepackage{tikz}
\usepackage{tikz-3dplot}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{0.125pt}
%
% File name: skew-polygon.tex
% Description: 
% A geometric representation of a skew polygon is shown.
% 
% Date of creation: October, 27th, 2021.
% Date of last modification: October, 9th, 2022.
% Author: Efra�n Soto Apolinar.
% https://www.aprendematematicas.org.mx/author/efrain-soto-apolinar/instructing-courses/
% Source: page 352 of the 
% Glosario Ilustrado de Matem\'aticas Escolares.
% https://tinyurl.com/5udm2ufy
% English version: 
% https://tinyurl.com/yayyxrbz
% 
% Terms of use: According to TikZ.net
% https://creativecommons.org/licenses/by-nc-sa/4.0/
% Your commitment to the terms of use is greatly appreciated.
%
\begin{document}
%
\tdplotsetmaincoords{75}{110}
%
\begin{tikzpicture}[tdplot_main_coords,scale=1.75]
    \pgfmathsetmacro{\a}{3.0} % length
    \pgfmathsetmacro{\h}{1.0}   % height
    \pgfmathsetmacro{\n}{100}   % number of intervals
    % Vertices of the box
    \coordinate (O) at (0,0,0);
    \coordinate (A) at (\a,0,0);
    \coordinate (B) at (\a,\a,0);
    \coordinate (C) at (0,\a,0);
    \coordinate (D) at (0,0,\h);
    \coordinate (E) at (\a,0,\h);
    \coordinate (F) at (\a,\a,\h);
 
 
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