Question

find the cost of painting the walls of a room if the room is 4 m 50 cm high and each side of the room is 6 m long the cost of painting is rs 10 per sq m. ​

Answer 1

the cost of painting the walls is 108000 Rs

Answer 2

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The cost of painting the wall at Rs 10 per square metre = Rs 1080

Step-by-step explanation:

Given: The room is 4 m 50 cm high:

Height = 4.5 m

Each side of the room is 6 m long:

Length = Breadth = 6 m

We know that:

A room have 4 wall.

Formula used:

C. S. A. of rectangle = 2h(l + b) sq. unit

Where,

C. S. A. = Curved surface area

l = Length

b = Breadth

h = Height

Now, Finding the area of the four wall:

Area of four wall = 2 × 4.5 (6 + 6) m²

Area of four wall = 9 × 12 m²

Area of four wall = 108 m²

Finding the cost of painting the wall:

Given: Cost of painting 1 m² wall = Rs 10

∴ Cost of painting 108 m² wall = Rs 10 × 108

∴ Cost of painting 108 m² wall = Rs 1080