Question

Three cubes of side $4cm$ each, are joined end to end. Then, the total surface area of the resultant cuboid is

• A. $224c{m}^2$
• B. $124c{m}^2$
• C. $220c{m}^2$
• D. None of these

Answer 1

The correct option is A

$224c{m}^2$

Dimensions of the cuboid formed :

Length, $l=12cm$
Breadth, $b=4cm$
Height, $h=4cm$

Total surface area of the cuboid formed $=2(l\times b+b\times h+l\times h)$

$=2(12\times 4+4\times 4+4\times 12)$

$=2(48+16+48)$

$=2\times 112=224c{m}^2$