%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 05-01-2 auf Seite 64.
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%%  Copyright (C) 2016 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{145.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pstricks}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid](3,3)
 \pscurve[showpoints,linecolor=red,
     linewidth=1.5pt](0,1)(2,2.5)(3,0)
 \pspolygon[linewidth=0.3pt](0,1)(2,2.5)(3,0)
 \rput[lC]{-105.7}(2,2.5){\psarc(0,0){0.25}{0}{90}
  \psset{linewidth=0.2pt,linestyle=dashed}
  \psline(0,-1)(0,1)\psline(0,0)(1.5,0)}
 \uput[-75](0,1){A}\uput[0](3,0){B}\uput[45](2,2.5){C}
\end{pspicture}
\end{document}