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729 = s³
∛729 = ∛s³
9 = s
a = s√2
= 9√2 cm
b = s
= 9 cm
a² + b² = c²
(9√2)² + 9² = c²
81√4 + 81 = c²
81 × 2 + 81 = c²
162 + 81 = c²
243 = c²
√81×3 = √c²
9√3 = c
Jadi diagonal kubus tersebut adalah 9√3 cm.