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b. p×l×t = 80×20×35 = 56000
= 2 (80.20 + 80.35 + 20.35)
= 2 (1600 + 2800 + 700)
= 2 × 5100
= 10200 cm²
b. V = p × l × t
= 80 × 20 × 35 cm³
= 62.000 cm³
= 62 liter