Question

The areas of 2 circle are in the ratio of 4 is to 9.Find ratio of their circumferences

Answer 1

ratio in area = 4:9

ratio of radius = 4πr²/9πR²

= 4r²/9R²

= √4r²/√9R²

= 2r/3R

= 2:3

ratio in circumference = 2πr/2πR

= 2r/3R

ratio of circumference = 2 :3

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