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Rumus luas permukaan balok : 2pl + 2lt + 2pt
=> 376 = 2(10)(6) + 2(6)t + 2(10)t
=> 376 = 120 + 12t +20t
=> 256 = 32t
=> t = 8 cm (C)
376/2 = 10t + 60+ 6t
188 - 60 = 16t
128=16t
8=t