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s^3 = 343 cm^3
s = 7 cm -----> (7*7*& = 343 cm)
Luas bidang diagoal kubus = s^2 akar 2
= 7^2 akar 2
= 49 akar 2
Jadi, Luas bidang diagoal kubus = 49 akar2
Luas bidang diagonal kubus
= rusuk = 7 cm
maka,
Luas bidang diagonal kubus
Semoga membantu :)