\ANG{
\begin{minipage}[t]{9cm}
Erg"anze so oft, wie angegeben, zu  Verh"altnisgleichungen,
die  in der nebenstehenden (nicht ma"sst"ablichen) 
Strahlensatzfigur g"ultig sind.
\begin{enumerate}
\item
${\D e\over \D b}= \dots = \dots = \dots$
\item
${\D x \over \D y}= \dots = \dots$
\item
${\D f+e \over \D f} = \dots $
\end{enumerate}
\end{minipage}
\begin{minipage}[t]{7cm}
 \beginpicture
     \setcoordinatesystem units <0.6 mm, 0.6mm> point at  0   50
     \setplotarea x from -40 to 40, y from -50 to 30 
     %Punkte: Links oben  (-35   | 30)
     %        Links unten (-20   |-50)
     %        Rechts oben ( 13.33| 33.33)
     %        Rechts unten( 52.5 |-45) 
     \plot -35     30     52.5  -45   -20  -50   13.33  33.33   -35   30 /
     \plot -12 -30  31.5  -27 /
     \put {$z$} at -11     34
     \put {$y$} at  8     -25
     \put {$x$} at 13     -45 
     \put {$a$} at 38     -37
     \put {$b$} at 13     -14
     \put {$d$} at  4      19
     \put {$c$} at -16     17
     \put {$e$} at -4     -16
     \put {$f$} at -14    -42   
\endpicture
\end{minipage}
}
\LSG{
\begin{enumerate}
\item
${\D \strut e\over \D\strut  b}= 
 {\D\strut  d\over \D\strut c} = {\D \strut f\over \D \strut a} = 
{\D e+f \strut \over \D \strut  b+a}$
\item
${\D \strut x \over \D\strut  y}= {\D \strut f+e \over \D \strut e} = {\D \strut a+b \over \D \strut b}$
\item
${\D \strut f+e \over \D \strut f} = {\D \strut b+a \over \D \strut a} $
\end{enumerate}
}


