TeX Quellcode:
\begin{array}{rclcc}a^2 &=& h^2+p^2 &\vert &\sqrt{}\\a &=& \sqrt{h^2+p^2}\\&\approx& \sqrt{0{,}39^2+0{,}3^2}\\&\approx & 0{,}49\, cm\end{array}