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l = 4 dm = 40 cm
t = 250 cm
V = plt
V = 90 cm x 40 cm x 250 cm
V = 900.000 cm3
L permukaan = 2 (pl + pt + lt)
= 2 ((90 x 40) + (90 x 250) + (40 x 250))
= 2 x 3.600 + 22.500 + 10.000
L permukaan = 30.500 cm
maaf kalo salah