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s = 9√2 /√2
= 9 cm
luas = 6 x s x s
= 6 x 9 x 9
= 486 cm²
=9√2 . 9√2
=18√2
=9 cm
L.perm kubus= 6p²
= 6.p²
= 6.(9)²
= 6 . 81
= 486 cm