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= 226080
V 2 bola = 4/3 × 3,14×12×12×12×2
= 14469,12
V total = 226080 + 14469,12
= 240549,12
V = π ×r×r×t
240549,12 = 3,14 ×30×30×t
240549,12= 2826 t
t = 240549,12 : 2826
=85,12
kenaikan tinggi = 85,12 - 80
= 5,12cm