the ratio between the radii of two circle is 5 : 7 find the ratio between their circumference and areas
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The ratio of the circumference of the circle = 5 : 7
Let circumference of first ratio = 5x
∴ 2πr = 5x ⇒ r = 5x/2π
and the circumference of second ratio = 7x
∴ 2πr = 7x ⇒ r = 7x/2π
Ratio between their radii = 5x/2π: 7x/2π
= 5 : 7
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