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= 1/4 . r² ∛ × t
= 1/4 . 20²∛ × 24
= 100∛ × 24
= 2400
= 2400.2.3√
= 14.400 cm³
Lp = 2. 100∛ + (20×4 × 24)
= 200 + 1920