Question

3. Find the area of four walls of a room (Assume that there are no doors or windows) if its
length 12 m., breadth 10 m. and height 7.5 m.​

Answer 1

Answer:

330m sq

Step-by-step explanation:

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Answer 2

Answer :

›»› The area of four walls of a room is 330 m².

Given :

• Length of a four walls = 12 m.
• Breadth of a four walls = 10 m.
• Height of a four walls = 7.5 m.

To Find :

• Area of four walls = ?

Solution :

As we know that

→ Area of four walls = 2(length * height + breadth * height)

→ Area of four walls = 2(length + breadth) * height

→ Area of four walls = 2(l + b) * h

→ Area of four walls = 2(12 + 10) * 7.5

→ Area of four walls = (2 * 12) + (2 * 10) * 7.5

→ Area of four walls = 24 + (2 * 10) * 7.5

→ Area of four walls = 24 + 20 * 7.5

→ Area of four walls = 44 * 7.5

→ Area of four walls = 330

Hence, the area of four walls of a room is 330 m².