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28 = √(6x)² + (3x)² + (2x)²
28 = √36x² + 9x² + 4x²
28 = √49x²
28 = 7x
x = 28 / 7
x = 4
panjang = 6 * 4 = 24 cm
lebar = 3 * 4 = 12 cm
tinggi = 2 * 4 = 8 cm
volume = 24 * 12 * 8
= 2304 cm³
= 2,304 dm³