Question

The radii of two circles are in ratio 2:3.what is the ratio of their circumferences

Answer 1

let radii be x
so radius=2x and 3x of two circles respectively.
circumference of first circle=2πr
or, 2π×2x
or,4πx

circumference of second circle=2πr
or,2π×3x
or,6πx

now ratio =4πx / 6πx
therefore ratio=2/3

2:3. ans.


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