Answer :


In the figure above two cubes are joined end to end such that a cuboid is formed.
Volume of cube = 64 cm3

We know that,

Side of cube =

=

= 4 cm

Side of cube = 4 cm
Now these two cubes when joined, we can see from the figure that, their lengths are added and breadth and height remains the same.

Length of new cuboid = 8 cm

Height of new cuboid = 4 cm

Width of new cuboid = 4 cm

We know that:

Surface Area = 2(lb + lh + bh)

Surface Area = 2(8 x 4 + 8 x 4 + 4 x 4)

= 2 x 80

 = 160 cm2

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