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= √30
= 10√3
s = 10cm
L.permukaan kubus = 6 x s²
= 6 x 10²
= 600cm²
2s² = √30²
2s² = 30
s² = 15
Luas kubus = 6 x s²
= 6 x 15
= 90
Jadi, luas permukaan kubus tsb adalah 90cm²