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81 cm² = s²
s = √ 81 cm²
s = 9 cm
panjang sisi (s) = 9 cm
volume kubus
= s x s x s
= 9cm x 9 cm x 9 cm
= 729 cm³
jadi volume kubus tsb adalah 729 cm³
81 = S^2
S = √81
S = 9
V = S^3
= 9^3
= 729 cm^3