TeX Quellcode:
\begin{array}{rcl} A_M & =& 2ah_s \cr A_M & =& 2a\sqrt{h^2+\left(\dfrac{a}{2}\right)^2} \cr A_M & =& 2\cdot 7 \, m \cdot \sqrt{(5 \, m)^2+\left(\dfrac{7}{2} \, m \right)^2} \cr A_M & \approx& 85{,}45\, m^2 \end{array}