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 $ A  = a^{2} $
                                      
                                          $ a = \sqrt{A} $
                                      
                                          $ U = 4\cdot a $
                                      
                                          $ a = \frac{U}{4} $
                                      
                                          $ d = a\cdot \sqrt{2} $
                                      
                                          $ a = \frac{d}{\sqrt{2}} $
Geometrie-Viereck-Quadrat
 $A  = a^{2}$ 
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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: 06
            
        
           $\begin{array}{l} 
      \text{Gegeben:}\\\text{Umfang} \qquad U \qquad [m] \\
      \\ \text{Gesucht:} \\\text{Seite} \qquad a \qquad [m] \\
     \\ a = \frac{U}{4}\\ \textbf{Gegeben:} \\ U=1\frac{1}{6}m \qquad \\ \\ \textbf{Rechnung:} \\
      a = \frac{U}{4} \\
      U=1\frac{1}{6}m\\
      a = \frac{1\frac{1}{6}m}{4}\\\\a=\frac{7}{24}m
    \\\\\\ \small \begin{array}{|l|} \hline U=\\  \hline 1\frac{1}{6} m  \\  \hline 11\frac{2}{3} dm  \\  \hline 116\frac{2}{3} cm  \\  \hline 1166\frac{2}{3} mm  \\  \hline 1166666\frac{2}{3} \mu m  \\ \hline \end{array} \small \begin{array}{|l|} \hline a=\\  \hline \frac{7}{24} m  \\  \hline 2\frac{11}{12} dm  \\  \hline 29\frac{1}{6} cm  \\  \hline 291\frac{2}{3} mm  \\  \hline 291666\frac{2}{3} \mu m  \\ \hline \end{array}  \end{array}$