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vol 2 bola : 3,14 × 12×12×12×2 = 14469,12
V gabungn : 226080+ 14469,12 = 240549,12
240549,12 = 3,14×30×30×t
240549,12 = 2826.t
t = 240549,12 : 2826 = 85,12
Kenaikan tinggi : 85,12 - 80 = 5,12 cm