Architects design many types of buildings. They draw plans for houses, such as the plan shown in Fig. 9.68: An architect wants to install decorative moulding around the ceilings in all the rooms. The decorative moulding costs ₹500/metre. Find how much moulding will be needed for dining room

Solution:

The figure represents the plan for a house.

An architect wants to install decorative moulding around the ceilings in all the rooms.

The decorative moulding costs ₹500/metre.

We have to find the moulding needed for the dining room.

From the plan we observe that the dining room is in rectangular shape.

Perimeter of rectangle = 2(length+breadth)

Length = 5.41 m

Breadth = 5.48 m

Perimeter = 2(5.41 + 5.48)

= 2(10.89)

= 21.78 m

Therefore, the moudling needed for the dining room is 21.78 m.

✦ Try This: A room is 16 m long and 13.5 m broad. Find the cost of covering its floor with 75-m-wide carpet at Rs 60 per metre.

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 11

NCERT Exemplar Class 7 Maths Chapter 9 Problem 126 (a) (iii)

Architects design many types of buildings. They draw plans for houses, such as the plan shown in Fig. 9.68: An architect wants to install decorative moulding around the ceilings in all the rooms. The decorative moulding costs ₹500/metre. Find how much moulding will be needed for dining room

Summary:

Architects design many types of buildings. They draw plans for houses, such as the plan shown in Fig. 9.68: An architect wants to install decorative moulding around the ceilings in all the rooms. The decorative moulding costs ₹500/metre. 21.78 m of moulding will be needed for the dining room.

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