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= √486 : 6
=√81
= 9 cm=>rusuk kubus
volume = r x r x r
= 9 x 9 x 9
= 729 cm³
486 = 6 x r^
81 = r^
r = √81
r = 9cm
b. V = s x s x s
V = 9 x 9 x 9
V = 729