Question

the ratio of circumference of two circle, 5:3, what is the ratio of their radii​

Answer 1

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Let the circumference of one circle be 2πr
And the circumference of second circle be 2πR.
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$\frac{circumference of 1st circle}{circumference of 2nd circle} = \frac{5}{3}$
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$\frac{2πr}{2πR} = \frac{5}{3}$
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$\frac{r}{R} = \frac{5}{3}$
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Ration of their radii = 5:3

Answer 2

Given :

• Ratio of the circumference of circle is 5 : 3

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To Find :

• Ratio of radii

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Solution :

We know that

★ Circumference of circle = 2πr

➤ Let the radii be R and r

→ 5/3 = 2πR/2πr

→ 5/3 = πR/πr

→ 5/3 = R/r

∴ The ratio of their radii is 5:3