$A = a^{2}$
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$a = \sqrt{A}$
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$U = 4\cdot a$
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$a = \frac{U}{4}$
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$d = a\cdot \sqrt{2}$
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$a = \frac{d}{\sqrt{2}}$
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Beispiel Nr: 20
$\begin{array}{l} \text{Gegeben:}\\\text{Seite} \qquad a \qquad [m] \\ \\ \text{Gesucht:} \\\text{Fläche} \qquad A \qquad [m^{2}] \\ \\ A = a^{2}\\ \textbf{Gegeben:} \\ a=4\frac{1}{5}m \qquad \\ \\ \textbf{Rechnung:} \\ A = a^{2} \\ a=4\frac{1}{5}m\\ A = (4\frac{1}{5}m)^{2}\\\\A_{q}=17\frac{16}{25}m^{2} \\\\\\ \small \begin{array}{|l|} \hline a=\\ \hline 4\frac{1}{5} m \\ \hline 42 dm \\ \hline 420 cm \\ \hline 4,2\cdot 10^{3} mm \\ \hline 4,2\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline Aq=\\ \hline 17\frac{16}{25} m^2 \\ \hline 1,76\cdot 10^{3} dm^2 \\ \hline 1,76\cdot 10^{5} cm^2 \\ \hline 1,76\cdot 10^{7} mm^2 \\ \hline 0,176 a \\ \hline 0,00176 ha \\ \hline \end{array} \end{array}$