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22/7r²×12= 1848
22/7r²= 1848:12
22/7r² = 154
r² = 154×7/22
r² = 49
r = 7
jari jari tabung yg sekarang
=7-3,5 = 3,5cm
volume tabung sekarang
¶r²t
=22/7×3,5×3,5×12
=462 cm²
semoga bener.. kalau salah maaf