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Lp = (pl + 2pt + 2lt) + (4.LΔ)
Lp = (6.6 + 2.6.12 + 2.6.12) + (4.1/2.6.5)
Lp = (36 + 144 + 144) + 60
Lp = 324 + 60
Lp = 384 cm2