TeX Quellcode:

\begin{array}{rclcc} a^2+b^2 &=& c^2 & \vert & -b^2 \cr a^2 &=& c^2-b^2 & \vert & \sqrt{} \cr a &=& \sqrt{c^2-b^2} \cr &\approx& \sqrt{22{,}53^2-5{,}2^2} \cr &\approx& \sqrt{480{,}71} \cr & \approx & 21{,}93 \, cm \end{array}