%% 
%%  A DANTE-Edition example
%% 
%%  Example 29-02-26 on page 577.
%% 
%%  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{pst-eucl}

\begin{document}
\begin{pspicture}(-2,-2)(2,2)
  \pstGeonode[PosAngle=150]{O}(0,1.5){A}
  \pstCircleOA[linecolor=red]{O}{A}
  \pstGeonode(0,2){B}(2,-2){C} \pstLineAB{B}{C}
  \pstInterLC[PosAngle={10}]{B}{C}{O}{A}{D}{E}
  \pspolygon[fillcolor=black!10,
      fillstyle=solid](O)(D)(E)
\end{pspicture}
\end{document}