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4√2 = s√2
s = 4
l. permukaan kubus = 6s²
= 6.4²
= 96 cm² ( A)
caranya:
kalo diagonal bidang akarnya 2, kalo diagonar ruang akarnya 3
jadi sisi kubusnya itu 4
Luasnya = 6s²
= 6. 4²
= 96cm²
jadikan yang terbaik dong :)