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.
Solution:
Given, a dinner plate is in the form of a circle.
A circular region encloses a beautiful design.
The inner circumference is 352 mm and the outer is 396 mm.
We have to find the width of the circular design.
Circumference = 2πr
Outer circumference = 2πR
396 = 2(22/7)R
396 = (44/7)R
R = 396(7)/44
R = 9(7)
R = 63 mm
Inner circumference = 2πr
352 = 2(22/7)r
352 = (44/7)r
r = 352(7)/44
r = 8(7)
r = 56 mm
Width of circular ring = R - r
= 63 - 56
= 7 mm
Therefore, the width of the design is 7 mm.
✦ Try This: A dinner plate is in the form of a circle. A circular region encloses a beautiful design. The inner circumference is 400 mm and outer is 600 mm. Find the width of circular design.
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 11
NCERT Exemplar Class 7 Maths Chapter 9 Problem 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.
Summary:
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. The width of the circular design is 7 mm.
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