$
\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=1\frac{1}{5}m \qquad a=1\frac{1}{2}m \qquad \\ \\ \textbf{Rechnung:} \\
A = \frac{a\cdot b}{ 2} \\
b=1\frac{1}{5}m\\
a=1\frac{1}{2}m\\
A = \frac{1\frac{1}{2}m\cdot 1\frac{1}{5}m}{ 2}\\\\A=\frac{9}{10}m^{2}
\\\\\\ \small \begin{array}{|l|} \hline b=\\ \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 a=\\ \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}$