Question

A cuboid is $12cm$ long, $9cm$ broad and $8cm$ high. Its total surface area is
$\left(a\right)864c{m}^2\left(b\right)552c{m}^2\left(c\right)432c{m}^2\left(d\right)276c{m}^2$

Answer 1

The correct option is (b): $552c{m}^2$

Given: Length of cuboid, $l=12cm$

Breadth of cuboid, $b=9cm$

and, height of cuboid, $h=8cm$

Total surface area of the cuboid $=2(lb+bh+lh)$

$=2\left[\right(12\times 9)+(8\times 9)+(12\times 8\left)\right]c{m}^2$

$=2[108+72+96]c{m}^2$

$=2\left(276\right)c{m}^2$

$=552c{m}^2$