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= s×s×s
= 9cm × 9cm × 9cm
= 729cm³
maka jawabannya = 9cm
semoga membantu. maaf kalau salah.
729 = s^3
s = 9
Sisi kubus = 9
Ditanya diagonal bidang maka
c^2 = a^2 + b^2
c^2 = 9^2 + 9^2
c^2 = 81 + 81
c^2 = 162
c^2 = 81 ×2
c= 9x V2
Keterangan V = akar