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7√2 = s√2
s = 7 cm
jadi, Lp.kubus = 6.s²
= 6.7²
= 6.49
= 294 cm²
Misal a = panjang rusuk, maka berlaku :
a² + a² = (7√2)²
a² + a² = 98
2a² = 98
a² = 49
a = √49
a = 7
Lp = 6 x a x a
= 6 x 7 x 7
= 294cm²
Jadi, luas permukannya adalah 294cm²