If the length of diagonal of a cube is 
then its surface area is
Diagonal of the cube = side 
Given diagonal =8 
cm = side 
⇒ side = 8 cm
Total surface area of a cube = 6(side)2
⇒ Surface area = 6(8)2 = 6×64 = 384 cm2
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If the length of diagonal of a cube is then its surface area is
Diagonal of the cube = side
Given diagonal =8 cm = side
⇒ side = 8 cm
Total surface area of a cube = 6(side)2
⇒ Surface area = 6(8)2 = 6×64 = 384 cm2