Question

The ratio of circumference of two circles is 5:3. What is the ratio of their radii?

Answer 1

radius of 1st circle be 5x
radius of 2nd circle be 3x
compare both the circle

circumference of 1st circle/circumference of 2nd circle =2 pie R/2 pie r
5x/3x=2×22/7 R/2×22/7 r
5/3=R/r
so ratio=5:3
hope this will help you.
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Answer 2

The ratio of their "radii is 5 : 3".

Step-by-step explanation:

Let radius of first circle = R and radius of second circle = r

Given,

The ratio of circumference of two circles = 5 : 3

To find, the ratio of their radii = ?

We know that,

The circumference of circle = $2\pi r$

∴ $\dfrac{The circumference of first circle }{The circumference of second circle } = \dfrac{2\pi R}{2\pi r}$

⇒ $\dfrac{R}{r}=\dfrac{5}{3}$= 5 : 3

Hence, the ratio of their radii is 5 : 3.