Find the area of four walls of a room of 7.5 m long, 4.5 m broad and 3 m high. Also,
the cost of plastering its floor, ceiling and four walls at the rate of 12 per square
neglecting the areas of doors and windows
Answers
The area of four walls of a room is 72 square meters.
The cost of plastering its floor, ceiling and four walls at the rate of 12 per square = Rs 1674
Explanation:
Given : Length of room = 7.5 m
breadth =4.5 m
Height =3 m
Let length = l , breadth = b and height = h
Area of four walls = lateral surface area =2h (l+b)
= 2 (3)(7.5+4.5)=6(12)=72 square meters.
Hence, the area of four walls of a room is 72 square meters.
Total area of room : 2(lb+bh+hl) = 2((7.5)(4.5)+(4.5)(3)+(3)(7.5))
=2(69.75)=139.5 square meters.
Rate of plastering = Rs 12 per square
Then the total cost of plastering = (Rate of plastering)x (Total area of room)
= 12 x 139.5 =Rs 1674
Hence, the cost of plastering its floor, ceiling and four walls at the rate of 12 per square = Rs 1674
# Learn more :
The sum of the area of floor and ceiling of a room is equal to the area of four walls. If the room is 24m long and 16m wide, find the height of the room
https://brainly.in/question/7124242