%% 
%%  Ein Beispiel der DANTE-Edition
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%%  7. Auflage
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%%  Beispiel 28-01-20 auf Seite 599.
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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{121.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-eucl,textcomp}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(3,3.2)
\pstTriangle[PosAngle=-90, PosAngleC=90]
  (0,0){A}(3,0){B}(0,3){C}
\pstMarkAngle[arrows=->]{B}{A}{C}{$\alpha$}
\pstMarkAngle[LabelAngleOffset=50,LabelRefPt=l]
  {A}{C}{B}{$\gamma$ 50\textdegree rotiert}
\pstMarkAngle[LabelSep=1,LabelRefPt=lb]
  {C}{B}{A}{$\beta\prime$}
\pstMarkAngle[LabelSep=1,LabelRefPt=rt]
  {C}{B}{A}{$\beta\prime\prime$}
\end{pspicture}
\end{document}