NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and SolutionsQuestion 129
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and Solutions
Question. 129
A dinner plate is in the form of a circle. A circular region encloses a beautiful design as shown in Fig. 9.70. The inner circumference is 352 mm and outer is 396 mm. Find the width of circular design.
Answer:
Width of circular design = 7 mm.
Detailed Answer with Explanation:
Inner radius = 352 ÷ (2π) ≈ 56. Outer radius = 396 ÷ (2π) ≈ 63. Width = 63 – 56 = 7 mm.