$ \text{Gegeben:}\\\text{Grundlinie c} \qquad c \qquad [m] \\ \text{Grundlinie a} \qquad a \qquad [m] \\ \text{Höhe} \qquad h \qquad [m] \\ \\ \text{Gesucht:} \\\text{Fläche} \qquad A \qquad [m^{2}] \\ \\ A = \frac{a+c}{ 2}\cdot h\\ \textbf{Gegeben:} \\ c=2\frac{1}{2}m \qquad a=2m \qquad h=5m \qquad \\ \\ \textbf{Rechnung:} \\ A = \frac{a+c}{ 2}\cdot h \\ c=2\frac{1}{2}m\\ a=2m\\ h=5m\\ A = \frac{2m+2\frac{1}{2}m}{ 2}\cdot 5m\\\\A=11\frac{1}{4}m^{2} \\\\\\ \small \begin{array}{|l|} \hline c=\\ \hline 2\frac{1}{2} m \\ \hline 25 dm \\ \hline 250 cm \\ \hline 2,5\cdot 10^{3} mm \\ \hline 2,5\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline a=\\ \hline 2 m \\ \hline 20 dm \\ \hline 200 cm \\ \hline 2\cdot 10^{3} mm \\ \hline 2\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline h=\\ \hline 5 m \\ \hline 50 dm \\ \hline 500 cm \\ \hline 5\cdot 10^{3} mm \\ \hline 5\cdot 10^{6} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline A=\\ \hline 11\frac{1}{4} m^2 \\ \hline 1,13\cdot 10^{3} dm^2 \\ \hline 1,13\cdot 10^{5} cm^2 \\ \hline 1,13\cdot 10^{7} mm^2 \\ \hline \frac{9}{80} a \\ \hline 0,00113 ha \\ \hline \end{array}$