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8 = sisi x √3
sisi = 8/√3 = (8/3)√3
Luas permukaan = 6 x sisi x sisi
= 6 x (8/3)√3 x (8/3)√3
= 384/3
= 128 cm²
r = 8/√2
luas kubus = 6 x r²
= 6 x (8/√2)²
= 6 x (64/2)
= 6 x 32
= 192 cm²
semoga membantu ya :)