U = 2 * pi * r^2 = 2 * pi * 2^2 = 25.13 m
U * 120/360 = 8.378 m
α = 360·h / U = 360·2.1 / 25.13274122 = 30.08 Grad
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Beantwortet: Das Rad einer Förderanlage hat einen Durchmesser von 4 m.
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