TeX Quellcode:

\begin{array}{rclcc} d^2 &=& a^2+a^2 \cr &=& 2a^2 &\vert& \sqrt{} \cr d &=& \sqrt{2a^2} \cr &=& a\cdot\sqrt{2} &\vert& : \sqrt{2} \cr \dfrac{d}{\sqrt{2}} &=& a \cr \cr a &=& \dfrac{5{,}657}{\sqrt{2}} \cr &\approx& 4\end{array}