TeX Quellcode:

\begin{array}{rcl} c &=& \sqrt{a^2+b^2} \cr c &=& \sqrt{(7 \,cm)^2+(4 \, cm)^2} \cr c &=& \sqrt{49 \,cm^2+16 \, cm^2} \cr c &=& \sqrt{65}\, cm \end{array}