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l = 50 cm = 5 dm
Lp = 302 dm²
Lp = 2 (pl + pt + lt)
302 = 2 (14 . 5 + 14t + 5t)
151 = 70 + 19t
19t = 81
t = 81/19 = 4.263 dm
V = p l t
V = 14 . 5 . 81/19 = 5670/19 = 298.421 dm³