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81 cm^2 = s^2
√81 cm^2 = √s^2
9 cm = s
V kubus = s^3
= 9cm^3
=729 cm^3
Jadi, volume kubus adalah 729 cm^3
81 = s²
s = √81
s = 9
V = s³
V = 9³
V = 729