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 living 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 living room.

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

Perimeter of rectangle = 2(length + breadth)

Length = 3.81 m

Breadth = 7.53 m

Perimeter = 2(3.81 + 7.53)

= 2(11.34)

= 22.68 m

Therefore, the moudling needed for the living room is 22.68 m.

✦ Try This: A room is 13 metres long and 4 metres 50 cm broad. What will be the cost of covering its floor with a carpet 50 cm wide at 50 paise per metre?

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

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

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 living 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. 22.68 m of moulding will be needed for the living room.

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