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Kąt B ma 60°, czyli miara kątów A i C, to:
|kA|+|kC|=180°-60°=120°
Kąt C, jest dwa razy większy od kąta A, czyli:
|kC|=2|kA|
|kA|+|kC|=120°
|kA|+2|kA|=120°
3|kA|=120° |:3
|kA|=40°
|kC|=2|kA|
|kC|=2*40°
|kC|=80°