Question

To find the cost of painting a wall, we need to find the perimeter of the wall.​

Answer 1

Answer:

False. To find the cost of painting a wall we need to find the area of the wall.

Answer 2

Answer:

No , if you want to find the cost of painting a wall, you need not to find the perimeter of the wall.

Instead

you need area.

Step-by-step explanation:

here are some examples

1. Find the area of four walls of a room having length, breadth and height as 8 m, 5 m and 3 m respectively. Find the cost of white-washing the walls at the rate of Rs. 15/m .

Ans

It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.

Area of four walls of the room is: 2h(l+b)

A=2h(l+b)=2×3(8+5)=6×13=78 m

2

Area of the ceiling is:

A=l×b=8×5=40 m

2

Total area of the four walls and the ceiling of the room is 78+40=118 m

2

It is given that cost of white washing is Rs.15/m

2

, therefore,

Total cost of white washing is:

118×15=1770

Hence, the cost of white washing the walls is Rs.1770.