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10 = a√2
a = 10/√2
= 5√2
Luas seluruh permukaan kubus = 6 x sisi x sisi
= 6 x 5√2 x 5√2
= 300 cm²
= 6 x sisi x sisi
= 6 x 5√2²
= 6 x 5√2 x 5√2
= 300 cm²