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12 = s akar 2
S = 12 / akar 2 dirasionalkan menjadi
S = 6 akar 2
Luas permukaan = 6S kuadrat
= 6 . 6 akar 2. 6 akar 2
=6 . 6 . 6. 2
= 432 cm kuadrat.
maaf jika kurang benra. terimakasih
12 = S√2
S = 12 / √2
S = (12/√2) x (√2/√2)
S = 6√2
luas permukaan kubus = 6 S²
= 6 ( 6√2)²
= 432 cm2