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Der Sinus ist definiert als das Verhältnis von Gegenkathete zu Hypotenuse im rechtwinkligen Dreieck.
Ein Beispiel:
sin(α) = 16 / 17,8
α = 64,0°
Sinus und Kosinus sind Dein Freund:
a) Hypotenuse = 17,8
b) Die bekommst Du nun selber hin
Beachte: Auf Taschenrechnern sind die Umkehrfunktionen des Sinus und Kosinus meist nicht als arcsin bzw. arccos bezeichnet, sondern tragen die Bezeichnung asin und acos oder sin-1 und cos-1.