Question

The perimeter of the floor of a room is $46m$ and its height is $3.5m$. Find the area of the walls of the room.

Answer 1

Area of wall $=2[l\times h+b\times h]$

$=2h[l+b]$

$=h\left[2\right(l+b\left)\right]$

$=h\times$ perimeter of floor

$=3.5\times 46=161m^2$.