Question

area of the four walls of a room 6 metre long 4 metre wide and height 7 metre.​

Answer 1

Answer:

Formula for area of 4 walls is 2( Length  + Breadth ) x Height

Length = 6m

Width or Breadth = 4m

Height = 7m

According to the formula, 2 ( 6 + 4 ) x 7

                                         = 2 x 10 x 7

                                         = 140m (Answer.)

Answer 2

The area of the four walls of a room = 40 square metre($m^{2}$)

Step-by-step explanation:

Given,

The length of a room (l) = 6 metre, the breadth of a room (b) = 4 metre and

The height of a room (h) = 7 metre

To find, the area of the four walls of a room = ?

We know that,

The area of the four walls of a room = 2(Lenght + Breadth) × Height

= 2(l + b) × h

= 2(6 + 4) × 7 square metre($m^{2}$)

= 2(10) × 7 square metre($m^{2}$)

= 20 × 7 square metre($m^{2}$)

= 140 square metre($m^{2}$)

Thus, the area of the four walls of a room = 40 square metre($m^{2}$)