8 akar2=s^2+s^2
128 =2s^2
s^2 =128/2
s =akar 8
L =6×L.panjang
=6×8×8
=384 cm^2
panjang diagonal sisi: a√2= 8√2
panjang rusuk (a): 8
panjang seluruh rusuk kubus: 8×12= 96 cm (D)
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8 akar2=s^2+s^2
128 =2s^2
s^2 =128/2
s =akar 8
L =6×L.panjang
=6×8×8
=384 cm^2
panjang diagonal sisi: a√2= 8√2
panjang rusuk (a): 8
panjang seluruh rusuk kubus: 8×12= 96 cm (D)