Truncated Cone

The graphic shows a truncated cone. The diameter of the cone changes from d_1 to d_2 along the x-direction.

Edit and compile if you like:

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% Truncated Cone
% Author: Mathias Magdowski
\documentclass{article}
\usepackage{tikz}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength{\PreviewBorder}{10pt}%
\usetikzlibrary{calc}
\usepackage{amssymb}
\begin{document}
\begin{tikzpicture}
    \draw[dashed,color=gray] (0,0) arc (-90:90:0.5 and 1.5);% right half of the left ellipse
    \draw[semithick] (0,0) -- (4,1);% bottom line
    \draw[semithick] (0,3) -- (4,2);% top line
    \draw[semithick] (0,0) arc (270:90:0.5 and 1.5);% left half of the left ellipse
    \draw[semithick] (4,1.5) ellipse (0.166 and 0.5);% right ellipse
    \draw (-1,1.5) node {$\varnothing d_1$};
    \draw (3.3,1.5) node {$\varnothing d_2$};
    \draw[|-,semithick] (0,-0.5) -- (4,-0.5);
    \draw[|->,semithick] (4,-0.5) -- (4.5,-0.5);
    \draw (0,-1) node {$x=0$};
    \draw (4,-1) node {$x=l$};
\end{tikzpicture}
\end{document}
 
 
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