$ \text{Gegeben:}\\\text{Umfang} \qquad U \qquad [m] \\ \\ \text{Gesucht:} \\\text{Seite} \qquad a \qquad [m] \\ \\ a = \frac{U}{4}\\ \textbf{Gegeben:} \\ U=1\frac{5}{7}m \qquad \\ \\ \textbf{Rechnung:} \\ a = \frac{U}{4} \\ U=1\frac{5}{7}m\\ a = \frac{1\frac{5}{7}m}{4}\\\\a=\frac{3}{7}m \\\\\\ \small \begin{array}{|l|} \hline U=\\ \hline 1\frac{5}{7} m \\ \hline 17\frac{1}{7} dm \\ \hline 171\frac{3}{7} cm \\ \hline 1714\frac{2}{7} mm \\ \hline 1714285\frac{5}{7} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline a=\\ \hline \frac{3}{7} m \\ \hline 4\frac{2}{7} dm \\ \hline 42\frac{6}{7} cm \\ \hline 428\frac{4}{7} mm \\ \hline 428571\frac{3}{7} \mu m \\ \hline \end{array}$