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384 = x × 2x × 3x
384 = 6x³
384/6 = x³
64 = x³
x = 4
panjang = x = 4 cm
lebar = 2x = 8 cm
tinggi = 3x = 12 cm
√8²+4² = √80 = 4√5
Panjang diagonal ruang:
= √12²+(4√5)²
= √144 + (16×5)
= √144 + 80
= √224
= 4√14