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V = 4 x 22/7 x 21³/3
V = 88 x 21² x 21/(7x3)
= 88 x 441
= 38.808 cm³
3) V = 4πr³/3
r³ = 3 x 4.500π/4π
r³ = 13.500π/4π
r³ = 3.375
r = ³√3.375
r = 15 cm
4) soal terpotong