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CBSE Class 10 Math 2023 All Sets Solved Paper

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Question : 14 of 20
Marks: +1, -0
The circumference of two circles are in the ratio 4:5. What is the ratio of their radii?
Solution:  
Circumference of a circle =2Ï€r=2\pi r
  2πR12πR2=  45\;\frac{2\pi R_1}{2\pi R_2} = \;\frac{4}{5}
  R1R2=  45\;\frac{R_1}{R_2} = \;\frac{4}{5}
R1:R2=4:5R_1:R_2 = 4:5
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