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79.200 = 2 . 22/7 . 70 (70 + t)
79.200 = 440 (70 + t)
70 + t = 79.200 : 440
70 + t = 180
t = 180 - 70
t = 110 cm
isi tangki = volume tangki
volume = π r² t
volume = 22/7 . 70² . 110
volume = 22/7 . 4.900 . 110
volume = 22 . 700 . 110
volume = 1.694.000 cm³