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panjang seluruh rusk = 84 cm
maka :
panjang rusuk = 12 x rusuk
84 = 12 rusuk
rusuk = 84/12
rusuk = 7 cm
V = 7³ = 343 cm³
84 = 12a
s = 7 cm
V kubus = s³
= 7³
=343 cm³