%%
%% Ein Beispiel der DANTE-Edition
%%
%% 7. Auflage
%%
%% Beispiel 28-02-11 auf Seite 612.
%%
%% 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}