TeX Quellcode:

\begin{array}{rcl} A_O & = & 2(ab+ac+bc) \cr A_O & = & 2\cdot(3{,}5 \, cm\cdot 5{,}5 \, cm+3{,}5 \, cm\cdot 11 \, cm+5{,}5 \, cm\cdot 11 \, cm) \cr A_O &=& 236{,}5 \, cm^2 \end{array}