Jumlah luas seluruh permukaan kubus yang panjang diagonal bidangnya 8 cm adalah....
A. 128
B. 192
C. 256
D. 384
A. 128
B. 192
C. 256
D. 384
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8 = s√2
S = 8 /√2
S = 8√2 / (√2)(√2)
S = 8√2 / 2
S = 4√2
Luas = 6S²
= 6 x (4√2)²
= 6 x 32
= 192 cm² ....B