$\begin{array}{l} \text{Gegeben:}\\\text{Diagonale f} \qquad f \qquad [m] \\ \text{Diagonale e} \qquad e \qquad [m] \\ \\ \text{Gesucht:} \\\text{Fläche} \qquad A \qquad [m^{2}] \\ \\ A = \frac{1}{2}\cdot e\cdot f\\ \textbf{Gegeben:} \\ f=1\frac{1}{5}m \qquad e=1\frac{1}{2}m \qquad \\ \\ \textbf{Rechnung:} \\ A = \frac{1}{2}\cdot e\cdot f \\ f=1\frac{1}{5}m\\ e=1\frac{1}{2}m\\ A = \frac{1}{2}\cdot 1\frac{1}{2}m\cdot 1\frac{1}{5}m \\\\ A=\frac{9}{10}m^{2} \\\\\\ \small \begin{array}{|l|} \hline f=\\ \hline 1\frac{1}{5} m \\ \hline 12 dm \\ \hline 120 cm \\ \hline 1,2\cdot 10^{3} mm \\ \hline 1,2\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline e=\\ \hline 1\frac{1}{2} m \\ \hline 15 dm \\ \hline 150 cm \\ \hline 1,5\cdot 10^{3} mm \\ \hline 1,5\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline A=\\ \hline \frac{9}{10} m^2 \\ \hline 90 dm^2 \\ \hline 9\cdot 10^{3} cm^2 \\ \hline 9\cdot 10^{5} mm^2 \\ \hline 0,009 a \\ \hline 9\cdot 10^{-5} ha \\ \hline \end{array} \end{array}$