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L bidang diagonal kubus = s² √2
s ² = 1/2 L√2
s² = 1/2 25 √2 √2
= 1/2 x 25 x 2
s = √25
= 5 cm
L permukaan = 6 s²
= 6 x 5²
= 6 x 25
= 150 cm²
Jadi Luas permukaan kubus 150 cm²