Question

Find the total area of four walls in each of rectangular room having length $10\mathrm{m}$, breath $5\mathrm{m}$ and height $4\mathrm{m}$

Answer 1

Calculate the total area of the four walls

Given, length of room, $l=10\mathrm{m}$

breadth of room, $b=5\mathrm{m}$

height of room, $h=4\mathrm{m}$

Area of the $4$ walls $=$ Perimeter of floor $\times$height

$$\begin{gathered} =2(l+b)·h \\ =2(10+5)·4 \\ =120{\mathrm{m}}^2 \end{gathered}$$

Therefore, the total area of the four walls is $120{\mathrm{m}}^2$.