\ANG{
%
%%\item
%
Bestimme zun"achst die n"otigen L"angen
und berechne den Fl"acheninhalt der folgenden Figur 
(Ma"se in ${\rm\,cm}$):
$$
\beginpicture
\setcoordinatesystem units <0.5mm,0.5mm>
\setplotarea x from 0 to 90, y from 0 to 50
\plotsymbolspacing 0.25 pt
\setsolid
\plot 0   0    0  40   40 40    80  0    0  0  /
\circulararc  90 degrees from    8  0  center at   0  0
\circulararc -45 degrees from   59  0  center at  80  0
\multiput {\circle*{2}}[Bl] at   3  3  /

\put {$8$}    at   40   5
\put {$4$}    at   20  44
\put {$45^0$} at   66   5
\endpicture
$$

}
\LSG{        
$24{\rm\,cm}^2$
}


