$
\text{Gegeben:}\\\text{Kathete} \qquad b \qquad [m] \\
\text{Kathete} \qquad a \qquad [m] \\
\\ \text{Gesucht:} \\\text{Fläche} \qquad A \qquad [m^{2}] \\
\\ A = \frac{a\cdot b}{ 2}\\ \textbf{Gegeben:} \\ b=120m \qquad a=80m \qquad \\ \\ \textbf{Rechnung:} \\
A = \frac{a\cdot b}{ 2} \\
b=120m\\
a=80m\\
A = \frac{80m\cdot 120m}{ 2}\\\\A=4,8\cdot 10^{3}m^{2}
\\\\\\ \small \begin{array}{|l|} \hline b=\\ \hline 120 m \\ \hline 1,2\cdot 10^{3} dm \\ \hline 1,2\cdot 10^{4} cm \\ \hline 1,2\cdot 10^{5} mm \\ \hline 1,2\cdot 10^{8} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline a=\\ \hline 80 m \\ \hline 800 dm \\ \hline 8\cdot 10^{3} cm \\ \hline 8\cdot 10^{4} mm \\ \hline 8\cdot 10^{7} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline A=\\ \hline 4,8\cdot 10^{3} m^2 \\ \hline 4,8\cdot 10^{5} dm^2 \\ \hline 4,8\cdot 10^{7} cm^2 \\ \hline 4,8\cdot 10^{9} mm^2 \\ \hline 48 a \\ \hline \frac{12}{25} ha \\ \hline \end{array}$