If the ratio of circumference of two circles is 5:7, then what is the ratio of their diameters?

7:5

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5:7

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25:49

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10:49

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Solution

The correct option is B 5:7
Circumference of a circle = 2𝜋r
= 𝜋d [d = 2r]
Ratio of circumference of a circle = 5:7

=> (circumference of circle 1)/(circumference of circle 2) = 5/7

=> 𝜋.d1/𝜋d2 = 5/7

=> d1/d2 = 5/7

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