%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 15-04-3 auf Seite 793.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\usepackage[T1]{fontenc}
\StartShownPreambleCommands
\usepackage{tikz}
\StopShownPreambleCommands
\begin{document}
\tikz \draw[thick,rounded corners=8pt]
  (0,0)--(0,2)--(1,3.25)--(2,2)--(2,0)--
  (0,2)--(2,2)--(0,0)--(2,0);
\tikz \draw[thick] plot[smooth,tension=0.7]
  coordinates{(0,0)(0,2)(1,3.25)(2,2)
    (2,0)(0,2)(2,2)(0,0)(2,0)};
\end{document}