Question

Two cubes each of $8cm$ edge are joined end to end. Find the surface area of the resulting cuboid.

• A. $600c{m}^2$
• B. $240c{m}^2$
• C. $640c{m}^2$
• D. $440c{m}^2$

Answer 1

The correct option is C $640c{m}^2$

REF image:

Surface area = surface area of the cuboid having sides $l,b,h$ as $(8+8)cm,8cm,8cm$ respectively.

$=2(lb+bh+hl)$

$=2\left(\right(8+8)\times 8+8\times 8+(8+8)\times 8)$

$=2(128+64+128)$

$=640c{m}^2$