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= 2 ( 4x * 3x + 4x * 2x + 3x * 2x)
= 2 (12x² + 8x² + 6x²)
= 2 (26x²)
= 52x²
52x² = 468
x² = 468 / 52
x² = 9
x = √9
x = 3
panjang = 3 * 4 = 12 cm
lebar = 3 * 3 = 9 cm
tinggi = 3 * 2 = 6 cm
468 = 2 (4x.3x + 4x.2x + 3x.2x)
234 = 12x^2 + 8x^2 + 6x^2
234 = 26x^2
x^2 = 234 : 26
x^2 = 9
x = 3
panjang = 4.3 = 12 cm
lebar = 3.3 = 9 cm
tinggi = 2.3 = 6 cm