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V₁ = ¹/₆ π d₁³
V₂ = ¹/₆ π d₂³
selisih
V₂ - V₁ = ¹/₆ π(d₂³ - d₁³)
V₂ - V₁ = ¹/₆ (²²/₇)(56³ - 14³)
V₂ -V₁ = ¹¹/₂₁ (172.872)
V₂ - V₁ = 90.552