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West Bengal Mathematics

18. Area of Circular Region

1. Real Numbers
2. Laws of Indices
3. Graph
4. Co-ordinate Geometry: Distance Formula
5. Linear Simultaneous Equations
6. Properties of Parallelogram
7. Polynomial
8. Factorisation
9. Transversal and Mid-Point Theorem
10. Profit and Loss
11. Statistics
12. Theorems on Area
13. Construction: (Construction of a Parallelogram whose measurement of one angle is given and equal in area of a triangle)
14. Construction: (Construction of a triangle equal in area of a quadrilateral)
15. Area and Perimeter of Triangle and Quadrilateral Shaped Region
16. Circumference of Circle
17. Theorems on concurrence
18. Area of Circular Region
19. Co-ordinate Geometry: Internal and External Division of Straight Line Segment
20. Co-ordinate Geometry: Area of Triangular Region
21. Logarithm

Let us do 18

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Q. 63.9( 11 Votes )

Palash and Piyali

Class 9th West Bengal Mathematics 18. Area of Circular Region

Answer :

let R be the radius of circle drawn by Palash and r be the radius of circle drawn by Piyali

Given the ratio of their radius = 4:5

⇒

Area of the two circles of Palash and Piyali would be πR² and πr², respectively.

Ratio of the area =

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