TeX Quellcode:

\begin{array}{rcl}\alpha + \beta + \gamma &=& \dfrac{\pi}{2} +120^\circ +180^\circ \\\alpha + \beta + \gamma &=& 90^\circ +120^\circ +180^\circ \\\alpha + \beta + \gamma &=& 390^\circ \\\alpha + \beta + \gamma &>& 360^\circ \\\end{array}