NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and SolutionsQuestion 126
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and Solutions
Question. 126
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 a decorative moulding around the ceilings in all the rooms. The decorative moulding costs ₹500/metre.
Answer:
(a) Family room: 20.1 m, Living room: 14.62 m, Dining room: 20.78 m, Bedroom 1: 12.16 m, Bedroom 2: 11 m
(b) Costs vary by carpet area: e.g., family = ₹5025, etc.
(c) Total cost of moulding = ₹39,330
Detailed Answer with Explanation:
Each perimeter computed as 2 × (length + breadth). Multiply by ₹500. Carpet costs found from area × ₹200.