Three blocks that are in the shape of a cube with each side 3.2 cm are attached end to end. Calculate the T.S.A of the resulting cuboid?

The correct answer is: 143.36

We are given the side of the cube as 3.2 cm.
When three cubes of side 3.2 cm are joined, the resulting shape is a cuboid of
length l = 3.2×3=9.6 cm;
breadth b = 3.2 cm
and height h= 3.2 cm

So, total surface area of a cuboid = 2(lb + bh + lh)

=2(9.6×3.2+3.2×3.2+9.6×3.2)

=143.36 cm²
Therefore the total surface area of the cuboid obtained is 143.36 cm²
Therefore the correct option is a)143.36