Question

Three cubes each of side $4cm$ are joined end to end. Find the surface area of the resulting cuboid.

• A. $284c{m}^2$
• B. $264c{m}^2$
• C. $244c{m}^2$
• D. $224c{m}^2$

Answer 1

The correct option is D $224c{m}^2$

Length of the resulting cuboid $4+4+4=12cm$

Height and breadth remain same as $4cm$

Total surface area of a cuboid of length $l$, breadth $b$ and height $h$.$=2(l\times b+b\times h+l\times h)$

So, the total surface area of this cuboid $=2(12\times 4+4\times 4+12\times 4)=224{cm}^2$