%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 28-02-23 auf Seite 617.
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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{169.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-eucl}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(5,5)
\pstTriangle[PointSymbol=none,
  linewidth=1pt](3,1){A}(0,4){B}(5,4.2){C}
\psset{RightAngleType=german,PosAngle=90,
  linecolor=red,CodeFigColor=red,nodesep=-0.5}
\pstMediatorAB{B}{A}{I}{M_I}
\pstMediatorAB[PointSymbol=none,
  PointNameB=none]{A}{C}{J}{M_J}
\pstMediatorAB[PosAngleA=45]{C}{B}{K}{M_K}
\end{pspicture}
\end{document}