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%% 
%%  A DANTE-Edition example
%% 
%%  Example 23-06-61 on page 414.
%% 
%%  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{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pst-solides3d}

\begin{document}
\begin{pspicture}(-3,-3)(4,3.5)  \psset{viewpoint=50 30 15,Decran=60,solidmemory}
\psSolid[object=plan,definition=equation,args={[1 0 0 0] 90},planmarks,name=Plain]
\psset{plan=Plain}
\psProjection[object=point,name=A,text=A,pos=ur](-2,1.25)
\psProjection[object=cercle,args=A 1,range=180 360]
\psProjection[object=cercle,args=1 1 .5,linecolor=blue]
\psProjection[object=point,name=a,text=A,pos=ul](0,0)
\psProjection[object=point,name=b,text=B,pos=ur](1.5,-1.5)
\psProjection[object=point,name=c,text=C,pos=ul](0,-1.5)
\psProjection[object=cercle,args=a b c,definition=ABcercle,linestyle=dashed,
  fillstyle=solid,fillcolor=green!35]
\end{pspicture}
\end{document}