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V balok = 2.187 cm³
Balok di susun atas 3 kubus
maka :
V kubus = Vbalok/3
= 2.187/3
= 729 cm³
V kubus = sisi³
729 = sisi³
sisi = √729
sisi = 9 cm
jadi lebar balok = 9 cm
Vbalok = 2187
3 Vkubus = 2187
V kubus = 729
s³ = 729
s = 9 cm
Maka lebar balok = 9 cm