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Panjang seluruh rusuk = 4p + 4l + 4t
456 = 4p + (4x21) + (4x13)
456 = 4p + 84 + 52
456 - 136 = 4p
80 = p
V balok = p x l x t
80 x 21 x 13
21.840
wkwk :D