Question

$3$ cubes of edge $4cm$ are joined end to end. Find surface area of resulting cuboid.

Answer 1

$3$ cubes of edge $4$cm are joined end to end, then length of cuboid$=4+4+4=12$cm

breadth and height$=4$cm

Surface area$=2(lb+bh+lh)$

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

$=2(48+16+48)$

$=2\left(112\right)$

$=224c{m}^2$.