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v 1/2 bola = 2/3 . 3,14 . r^3
= 2/3 . 3,14 . 12^3
= 2/3 . 3,14 . 1728
= 6,28 . 576
= 3617,28 cm^3
cara lain
v bola = 4/3 . π . r^3
v 1/2 bola = 2/3 . π . r^3
= 2/3 . π . 12^3
= 2/3 . π . 1728
= 1152 π cm^3