Question

The length, breadth, and height of a wooden box is $1m,60cm$, and $40cm$ respectively. Find the outer surface area of the wooden box.

Answer 1

External surface area$=2(lb+bh+hl)$
$=2[100\times 60+60\times 40+40\times 100]$
$=2[6000+2400+4000]$
$=2\left[12400\right]$
$=24800c{m}^2$
$=2.48m^2$