%%
%%  Ein Beispiel der DANTE-Edition
%%
%%  7. Auflage
%%
%%  Beispiel 28-02-11 auf Seite 612.
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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
%%
%%
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{193.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-eucl}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-2,-2)(2,2)
 \pstGeonode[PosAngle={20,90,0}]%
   {O}(-.6,1.5){A}(1.6,-.5){B}
 \pstSymO[CodeFigColor=blue,
   PosAngle={-90,180}]{O}{A, B}[C]
 \pspolygon[linewidth=1pt](A)(B)(C)(B')
 \pstLineAB[linestyle=dashed]{<->}{A}{C}
 \pstLineAB[linestyle=dashed]{<->}{B}{B'}
\end{pspicture}
\end{document}