%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 35-00-94 auf Seite 857.
%% 
%%  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
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-eucl}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-1,-2)(6,3)
\psset{%
RightAngleType=german,
MarkAngleRadius=1.2,
LabelSep=0.65,
shortput=nab,
PointName=none,
PointSymbol=none,
PtNameMath=false,
linewidth=0.7pt
}
\pstGeonode(0,0){O}(6;20){C}(C|O){A}(0,0.75){X}
\pspolygon[fillstyle=solid,fillcolor=lightgray!10](O)(A)(C)
\pstMarkAngle{A}{O}{C}{$\alpha$}
\pstRightAngle{C}{A}{O}
\pstTranslation{O}{X}{O,C}[O',C']
\pstMiddleAB{O'}{C'}{M}
\pstTranslation[DistCoef=0.2]{C'}{O'}{M}[M']
\pstGeonode(M|0,-1.5){Y}
\pstProjection{O}{C}{M}[M'']
\pstMiddleAB{M''}{M}{S}
\pstTranslation[DistCoef=0.15]{C'}{O'}{S}[A1]
\pstTranslation[DistCoef=0.15]{O'}{C'}{S}[A2]
\pstOrtSym{O'}{C'}{A1,A2}[A4,A3]
\pspolygon[fillstyle=solid,fillcolor=blue!50](A1)(A2)(A3)(A4)
\pstMiddleAB{M''}{A2}{R2}
\pstMiddleAB{M''}{A1}{R1}
\pstProjection{O}{C}{R2}[Z2]
\pstProjection{O}{C}{R1}[Z1]
\pstCircleOA{R2}{Z2}
\pstCircleOA{R1}{Z1}
\ncline{->}{M}{Y}
\ncline{->}{M}{M'}
\ncline[linestyle=dashed]{M'}{Y}
\pstMarkAngle{M}{Y}{M'}{$\alpha$}
\psdot(M)
\psdot(R1)
\psdot(R2)
\end{pspicture}
\end{document}
