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s√2 = √90
s = √45
s = 3√5
Lp kubus = 6s²
= 6 × (3√5)²
= 6 × 9 × 5
= 270 cm²
Maap kalo salah...
Diagonal sisi = s
= s
s =
s =
s =
Luas permukaan kubus = 6()
Luas permukaan kubus = 6(
Luas permukaan kubus = 6 x 45
Luas permukaan kubus = 270