Question

the perimeter of the floor of a room is 40m and its height is 3.5m. find the area of the four walls of the room. Also find the cost of preparing the four walls at $35 per m2​

Answer 1

Step-by-step explanation:

Perimeter of floor of room = 40m

Height of room = 3.5m

Area of four walls = 2 ( l + b ) h

40mx3.5m= 140 square m

Cost of papering four walls per square m = Rs.35

Cost of papering four walls 140 square metre

= Rs . 140 × 35 = Rs.4900

Answer 2

Answer:

Area of each wall is 35m²

Cost to prepare all walls $4900

Step-by-step explanation:

If floor is in square shape then

Perimeter = 4×side

40 = 4×side

Side = 10m

Area of one wall = 10×3.5 = 35m²

Area of all four walls seperately is 35m² each

For preparing 4 walls

Total area to be prepared is 4×35 = 140m²

Now cost of 1m² is 35$

Therefore cost of all four walls will be 35×140 = 4900$

If rectangular floor then area of walls will be perimeter×height rest will be same

Hope it will help you