Das Winkelmaß $\alpha \backslash alpha$ des Winkels $ASB={360}^{\circ }-\beta -{60}^{\circ }ASB\backslash \; =\backslash \; 360^\backslash circ\backslash \; -\backslash \; \backslash beta\backslash \; -\backslash \; 60^\backslash circ$

Der Winkel $\beta \backslash beta$ und der Winkel ${90}^{\circ }90^\backslash circ$ sind Scheitelwinkel, Scheitelwinkel sind gleich groß.

Der Winkel $\beta ={90}^{\circ }\backslash beta\backslash \; =\backslash \; 90^\backslash circ$

Berechnen des Winkelmaßes $\alpha \backslash alpha$:

$\alpha ={360}^{\circ }-{90}^{\circ }-{60}^{\circ }={210}^{\circ }\backslash alpha\backslash \; =\backslash \; 360^\backslash circ\backslash \; -\backslash \; 90^\backslash circ\backslash \; -\backslash \; 60^\backslash circ\backslash \; =\backslash \; 210^\backslash circ$

Das Winkelmaß $\alpha \alpha$ des Winkels $ASBASB$ beträgt: ${210}^{\circ }\backslash \; 210^\backslash circ$