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= 8√2
b) diagonal ruang = s√3
= 8√3
c) L bidang diagonal = s√2 × s
= 8√2 × 8
= 64√2
d) LP kubus = 6 × s × s
= 6 × 8 × 8
= 384
e) Volume = s × s × s
= 8 × 8 × 8
= 512