Question

If two cubes, each of side 12 cm are joined end to end, then the surface area of the resulting cuboid is

• A. $1728c{m}^2$
• B. $1440c{m}^2$
• C. $1445c{m}^2$
• D. $1450c{m}^2$

Answer 1

Answer: (B)

$1440c{m}^2$

Consider given the two cube, each of side 12cm.

If both cubes are joined end to end then dimension of new body will be,

$l=12+12=24cm$

$b=12cm$

$h=12cm$

Now, surface area of new body is,

$s=2(lb+bh+hl)=2(24\times 12+12\times 12+12\times 24)=1440c{m}^2$

Hence, this is the answer.