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1/3 x π x r² x t = 462
1/3 x 22/7 x 9 x r² = 462
22/7 x 3 x r² = 462
66/7 x r² = 462
r² = 462 x 7/66
r² = 7 x 7
r² = 49
r = √49
r = 7 cm
jawabannya adalah 7 cm