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d₂ = 2√225 - 81
d₂ = 2√144
d₂ = 2.12
d₂ = 24 dm
V = 1/3 x 1/2 x d₁ x d₂ x t
V = 1/3 x 1/2 x 18 x 24 x 10
V = 720 dm³