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1848 = 22/7 . r² . 12
1848 = 264/7 .r²
r² = 1848 . 7/264
r² = 49
r = √49
r = 7
jari jari tabung sekarang = 7 - 3,5 = 3,5 cm
volume tabung sekarang = π . r² . t
= 22/7 . 3,5² . 12
= 22/7 . 12,5 .12
= 22 . 1,75 .1,75
= 462 cm3