PI/6 entspricht 180°/6 = 30°
Damit kann man ein gleichseitiges Dreieck zeichnen.
Halbiert man es, erhält man ein rechtwinkeligges Dreieck mit den Winkeln 30° 60° und 90°
sin(30°) = halbe Seite/ganze Seite des Dreiecks = 1/2
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