TeX Quellcode:

\begin{array}{rclcl} A_2 &=& 0{,}5 \cdot A_1 \cr &=& 0{,}5 \cdot 16 \cr &=& 8 \cr \cr\cr A_2 &=& a_2^2 \cr\cr 8 &=& a_2^2 &\vert& \sqrt{} \cr\cr a_2 &=& \sqrt{8} \cr\cr &\approx& 2{,}83 \end{array}