%% 
%%  A DANTE-Edition example
%% 
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{129.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-eucl,textcomp}

\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}{$\gamma$ rotated 50\textdegree}
\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}