Beispiel Nr: 12
$ \text{Gegeben:}\\\text{Umfang} \qquad U \qquad [m] \\ \text{Länge} \qquad a \qquad [m] \\ \\ \text{Gesucht:} \\\text{Breite} \qquad b \qquad [m] \\ \\ b = \frac{U - 2\cdot a}{ 2}\\ \textbf{Gegeben:} \\ U=\frac{5}{9}m \qquad a=\frac{1}{2}m \qquad \\ \\ \textbf{Rechnung:} \\ b = \frac{U - 2\cdot a}{ 2} \\ U=\frac{5}{9}m\\ a=\frac{1}{2}m\\ b = \frac{\frac{5}{9}m - 2\cdot \frac{1}{2}m}{ 2}\\\\b=-\frac{2}{9}m \\\\\\ \tiny \begin{array}{|l|} \hline a=\\ \hline 0,5 m \\ \hline 5 dm \\ \hline 50 cm \\ \hline 500 mm \\ \hline 5\cdot 10^{5} \mu m \\ \hline 0,0005 km \\ \hline \end{array} \tiny \begin{array}{|l|} \hline U=\\ \hline 0,556 m \\ \hline 5,56 dm \\ \hline 55,6 cm \\ \hline 556 mm \\ \hline 5,56\cdot 10^{5} \mu m \\ \hline 0,000556 km \\ \hline \end{array} \tiny \begin{array}{|l|} \hline b=\\ \hline -0,222 m \\ \hline -2,22 dm \\ \hline -22,2 cm \\ \hline -222 mm \\ \hline -2,22\cdot 10^{5} \mu m \\ \hline -0,000222 km \\ \hline \end{array}$