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volume kerucut = 1/3 π x r x r x t
4 = 1/3 x π x r³
r³ = 12/π
volume 1/2 bola = 1/2 x 4/3 x π x r³
= 1/2 x 4/3 x π x (12/π) ----> π nya di coret
= 8
volume sisa = voulme 1/2 bola - volume kerucut
= 8 - 4
= 4 (C)