\ANG{
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%Satzgruppe des Pythagoras
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\begin{minipage}[t]{9cm}
Dem Kreis $k(M;r)$ ist ein Drachenviereck $ABCD$ einbeschrieben.\\
Die Diagonale $[BD]$ hat die L"ange $\overline{BD}=\frac{3}{2}r$.

Zeige, da"s dann gilt:\qquad $z=\overline{MP}=\frac{r}{4}\sqrt{7}$\,.
\end{minipage}
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