%% 
%%  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{177.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-eucl}

\begin{document}
\begin{pspicture}(-1.5,-1.5)(1.5,1.5)
  \psset{linecolor=black,CodeFig=true}
  \pstGeonode[PosAngle={-90,90,90,-90}](-1.25,-1.25){A}%
    (-1.25,1.25){B}(1.25,1.25){C}(1.25,-1.25){D}
  \pstLineAB{A}{B} \pstLineAB{B}{C}
  \pstLineAB{C}{D} \pstLineAB{D}{A}
  \pstRightAngle{A}{B}{C}
  \pstRightAngle[RightAngleSize=1]{B}{C}{D}
  \pstRightAngle[RightAngleType=german]{C}{D}{A}
  \pstRightAngle[RightAngleType=german,
    RightAngleSize=.75]{D}{A}{B}
\end{pspicture}
\end{document}