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29) Lp = 2 × ( pl + pt + lt )
= 2 × ( 16×8 + 16×12 + 8×12 )
= 2 × ( 128 + 192 + 96)
= 2 × 416
= 832 dm² ( B )

30) V = 12 × p × l × t
= 12 × 4m × 10cm × 6cm
= 12 × 400cm × 10cm × 6cm
= 288.000 cm³