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Bestimmung von \( c \) :
\( \frac{18,5-0}{0+\frac{c}{2}}=\tan \left(90 \circ-18^{\circ}\right)=\tan 72^{\circ}=\sqrt{5+2 \cdot \sqrt{5}} \)
\( c \approx 12,022 \)
\( A \approx \frac{1}{2} \cdot 12,022 \cdot 18,5=111,2035 F E \)
\( a^{2}=18,5^{2}+\left(\frac{12,022}{2}\right)^{2} \)
\( a=\sqrt{18,5^{2}+\left(\frac{12,022}{2}\right)^{2}} \)
\( U=12,022+2 \cdot \sqrt{18,5^{2}+\left(\frac{12,022}{2}\right)^{2}} \approx 50,95 L E \)
\( \mathrm{mf} \mathrm{G} \)
Moliets
