NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and Solutions
Question 129

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.

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