Two cubes, each of volume 512 cm3 are joined end to end. Find the surface area of the resulting cuboid.
Given,
Volume of 2 equal cubes = 512 cm3
= a3 = 512 = a = 
When these cubes joined end to end a cuboid is formed so,
Length of cuboid = 8+8 = 16 cm
Breadth of cuboid = 8 cm
Height of cuboid = 8 cm
So, surface area of cuboid = 2(lb+bh+hl) =2(16×8+8×8+8×16)
= 2×320 = 640 cm2
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