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V = 4/3 phi . r³
904,32 = 4/3 3,14 . r³
904,32 . 3 = 4 . 3,14 . r³
2712,96 = 12,56 r³
r³ = 2712,96 / 12,56
r³ = 216
r = ∛216
r = 6 cm
luas permukaan:
= 4 . phi . r²
= 4 . 3,14 . 6²
= 452,16 cm²
jawabannya B