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V kubus = × 1029 liter
V kubus = 343 dm³
r = 7 dm
Jadi, panjang rusuk kubus adalah 7 dm.
= 1/3 * 1029
= 343 liter
343 liter = 343 dm^{3}
rusuk * rusuk * rusuk = 343
rusuk = 7 dm