TeX Quellcode:

\begin{array}{rclcc}a^2 &=& h^2+p^2 &\vert & -p^2\\h^2 &=& a^2-p^2 &\vert & \sqrt{}\\h &=& \sqrt{a^2-p^2} \\&=& \sqrt{2{,}8^2-1^2} \\&\approx & 2{,}62\, mm\end{array}