Question

The circumference of two circles are in the ratio 5 : 7,find the ratio between their radii.​

Answer 1

Answer:

Given C

1

:C

2

=5:7

C

1

:C

2

=2πR

1

:2πR

2

5:7=R

1

:R

2

⇒R

1

:R

2

=5:7

Answer 2

Answer:

5 : 7

Step-by-step explanation:

circumference = 2πr

so ratio of any two circles with radii =   $\frac{2\pi R}{2\pi r}$

2π gets cancelled .

So the ratio of the circumference = the ratio of radii

= 5 : 7