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216 cm³ = (sisi)³
sisi = ∛216 cm³ = 6 cm
Panjang diagonal ruang = sisi x √3
= 6√3 cm
216 = s3
s = akar 3 216 = 6 cm
diagonal ruang kubus = s akar 3
= 6 akar 3 = 6
jadi diagonal ruang kubus tersebut adalah 6 cm