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= √12² : 2
= √144 :2
= √ 72
= 6 √2
sisi = 6√2
luas permukaan
Lp = 6 x s²
= 6 x 6√2 x 6√2
= 6 x 36√4
= 6 x 72
= 432
jawabnya C
12 = s√2
s =
L kubus = 6 × (6√2)²
= 6 × 72
= 432 cm²