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luas permukaan = 6x (7,5x7,5) = 337,5 cm2
K = 4s
30 = 4s
7,5 = s
kubus punya 6 sisi, maka luas permukaannya adalah 6s²
Lp = 6s²
= 6 × (7,5)²
= 6 × 56.25
= 337.5