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volume tabung = 3,14 . 1/4 . 80² . 90
volume tabung = 3,14 . 1/4 . 6400 . 90
volume tabung = 3,14 . 1600 . 90
volume tabung = 452160 cm³
volume minyak = 3/5 . volume tabung
volume minyak = 3/5 . 452160 cm³
volume minyak = 271296 cm³
tinggi minyak :
volume minyak = π . 1/4 . d² . t
271296 = 3,14 . 1/4 . 80² . t
271296 = 5024 . t
t = 271296 / 5024
t = 54 cm
jadi, tinggi minyak pada tabaung 54 cm,,