Question

find the ratio of circumference of two circle whose radii is in ratio 2:5​

Answer 1

Step-by-step explanation:

Given :-

The ratio of the radii of two circles is 2:5.

Let first circle's radius be '2x'

and second circle be '5x'

First circle circumference

Circumference =2πr

= 2 X 22/7 X 2x

= 44/7 X 2x

=88x/7

Second circle circumference

Circumference = 2πr

= 2 X 22/7 X 5x

= 44/7 X 5x

= 220x/7

Ratio of two circles circumference =

88x/7

(solve it further)

220x/7

= 2:5

                                                        or

ratio of radii=2:5

so ratio of circumference=?

circumference of circle=2Πr

ratio=

2×Π×2r/2×Π×5r

2:5

so ratio of circumference=2:5

Answer 2

Hello mate!

Here's your answer

》Let radious of 1st circle be 2x

Circumference = 2 × 22/7 × 2x

》Let radious of 2nd circle be 5x

Circumference = 2 × 22/7 × 5x

Ratio = 2×22/7×2x / 2×22/7×5x

= 2x / 5x

= 2/5

= 2:5

✌✌ Hope this helps you ✌ ✌