%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 28-01-23 auf Seite 600.
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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{pst-eucl}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-2,-2)(2,2)
 \psset{arrowscale=2, CodeFig=true}
 \pstGeonode[PosAngle=-135](-1.5,-.2){A}(.5,.2){B}(0,-2){D}
 \pstRotation[PosAngle=90, RotAngle=60,
  CodeFigColor=blue,
  TransformLabel=\frac{\pi}{3}]{A}{B}[C]
 \pstRotation[AngleCoef=.5, RotAngle=\pstAngleAOB{B}{A}{C},
  LabelAngleOffset=-45,
  TransformLabel=\frac{1}{2}\widehat{BAC}]{A}{D}[E]
\end{pspicture}
\end{document}