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L. permukaan = 432 m²
2 ( pl + pt + lt ) = 432
2 (6x.4x + 6x.3x + 4x.3x) = 432
2 (24x² + 18x² + 12x²) = 432
2 . 54x² = 432
108x² = 432
x² = 4
x = 2 cm
panjang = 6x = 6.2 =12 cm
lebar = 4x = 4.2 = 8 cm
tinggi = 3x = 3.2 = 6 cm
432 = 2(p.l+p.t+l.t)
216 = p.l+p.t+l.t
panjang : lebar : tinggi = 6 : 4 : 3
216 = 6x.4x+6x.3x+4x.3x
216 = 24x²+18x²+12x²
216 = 54x²
4 = x², x = 2 maka panjang = 6.2 = 12 m
lebar = 4.2 = 8 m
tinggi = 3.2 = 6 m