Question

3 cubes each of side 1 cm are joined end to end the surface area of the resulting solid is

Answer 1

Answer: 14 sq. cm

Step-by-step explanation:

resulting solid will be cuboid

as they are stacked one after the other, only it one dimension is changed.

hence length breadth and height will be 1, 1 and 3

surface area = 2( lb + bh + lh)

                     = 2(1*1 + 1*3 + 1*3 )= 14sq. cm

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Answer 2

When three cubes are joined end to end it forms a cuboid.

Therefore,

Length of cuboid is 3cm

Breadth of cuboid is 1cm

Height of cuboid is 1cm

So, surface area of resulting solid means cuboid = 2( lb+bh+hl)

= 2(3×1 +1×1 +1×3)

=2(3+1+3)

=2(7)

=14cmsquare