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4.phi.r² = 324 phi
4.r² = 324
r² = 324:4
r² = 81
r = √81
r = 9 cm
jadi,
V bola
= 4/3 . phi . r^3
= 4/3 . 3,14 . 9^3
= 4/3 . 3,14 . 729
= 4 . 3,14 . 243
= 3052,08 cm^3
^ = pangkat