$\begin{array}{l} \text{Gegeben:}\\\text{Winkel} \qquad \beta \qquad [^{\circ}] \\ \text{Winkel} \qquad \alpha \qquad [^{\circ}] \\ \text{Länge der Seite} \qquad b \qquad [m] \\ \\ \text{Gesucht:} \\\text{Länge der Seite} \qquad a \qquad [m] \\ \\ a = \frac{b\cdot sin\alpha }{ sin\beta }\\ \textbf{Gegeben:} \\ \beta=45^{\circ} \qquad \alpha=135^{\circ} \qquad b=7\frac{2}{5}m \qquad \\ \\ \textbf{Rechnung:} \\ a = \frac{b\cdot sin\alpha }{ sin\beta } \\ \beta=45^{\circ}\\ \alpha=135^{\circ}\\ b=7\frac{2}{5}m\\ a = \frac{7\frac{2}{5}m\cdot sin135^{\circ} }{ sin45^{\circ} }\\\\a=7\frac{2}{5}m \\\\\\ \small \begin{array}{|l|} \hline beta=\\ \hline 45 ° \\ \hline 2,7\cdot 10^{3} \text{'} \\ \hline 1,62\cdot 10^{5} \text{''} \\ \hline 50 gon \\ \hline 0,785 rad \\ \hline \end{array} \small \begin{array}{|l|} \hline alpha=\\ \hline 135 ° \\ \hline 8,1\cdot 10^{3} \text{'} \\ \hline 4,86\cdot 10^{5} \text{''} \\ \hline 150 gon \\ \hline 2,36 rad \\ \hline \end{array} \small \begin{array}{|l|} \hline b=\\ \hline 7\frac{2}{5} m \\ \hline 74 dm \\ \hline 740 cm \\ \hline 7,4\cdot 10^{3} mm \\ \hline 7,4\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline a=\\ \hline 7\frac{2}{5} m \\ \hline 74 dm \\ \hline 740 cm \\ \hline 7,4\cdot 10^{3} mm \\ \hline 7,4\cdot 10^{6} \mu m \\ \hline \end{array} \end{array}$