Truncated Cylinder

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\documentclass{article}
\usepackage{tikz}
\usepackage{tikz-3dplot}
\usetikzlibrary{math}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}
%
% File name: truncated-cylinder.tex
% Description: 
% A geometric representation of a truncated cylinder is shown.
% 
% Date of creation: April, 9th, 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 44 of the 
% Glosario Ilustrado de Matem\'aticas Escolares.
% https://tinyurl.com/5udm2ufy
%
% 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{70}{100}
    %
    \begin{tikzpicture}[tdplot_main_coords]
        \pgfmathsetmacro{\r}{2}
        % Base of the truncated cylinder
        \draw[thick,fill=cyan!35,opacity=0.75] plot[domain=0:6.2832,smooth,variable=\t] ({\r*cos(\t r)},{\r*sin(\t r)},{0.0});
        \draw[red,thick,dashed] plot[domain=1.570796327:4.71238898,smooth,variable=\t] ({\r*cos(\t r)},{\r*sin(\t r)},{0.0}); 
        % Vertical wall (back, external radius)
        \fill[gray!35,opacity=0.5] (0,\r,0) 
            -- plot[domain=1.571:4.71238898,smooth,variable=\t] ({\r*cos(\t r)},{\r*sin(\t r)},{0})
            -- (0,-\r,4) 
            -- plot[domain=4.71238898:1.571,smooth,variable=\t] ({\r*cos(\t r)},{\r*sin(\t r)},{4.0-\r*sin(\t r)})
            -- (0,\r,0);    
        % Vertical wall (front, external radius)
 
 
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