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= 5 cm
LP = (5 x 5) x 6
= 25 x 6
= 150 cm persegi
maaf kalo salah :)
Ka = 4 × s
20 = 4 × s
s = 20 : 4
s = 5
LP = 6 × s²
= 6 × 5²
= 6 × 25
= 150 cm²
Jadi luas permukaan kubus tersebut adalah 150 cm² (A).