TeX Quellcode:

\begin{array}{rclcc} d^2 &=& a^2+a^2+a^2 \cr &=& 3a^2 &\vert& \sqrt{} \cr d &=& \sqrt{3a^2} \cr &=& a\cdot\sqrt{3} &\vert& : \sqrt{3} \cr \dfrac{d}{\sqrt{3}} &=& a \cr \cr a &=& \dfrac{17{,}321}{\sqrt{3}} \cr &\approx& 10 \end{array}