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l = 8 cm
Lp = 376 cm²
Lp = 2 (pl + pt + lt )
376 = 2 (10 x 8 + 10 x t + 8 x t)
376 = 2 (80 + 10t + 8t)
376 = 2 (80 + 18t)
376 = 160 + 36t
36t = 376 - 160
36t = 216
t = 216/36
t = 6 cm
Volume = plt
= 10 x 8 x 6
= 480 cm³