Question

the radii of two circles are in the ratio 3 is 5 find the ratio between their circumference

Answer 1

Ratio of circle radii = 3:5

let the radii be 3x and 5x

circumference of first circle = 2 pi (3x)
circumference of the second circle = 2 pi (5x)

ratio = 2 pi (3x) /2 pi (5x)
= 3/5

Therefore ratio of the circumference = 3:5

Hope this helps you...:)

Answer 2

Ratio of circle= 3:5

let the radii be 3x and 5x

circumference of first circle = 2(3x)
circumference of the second circle = 2(5x)

ratio = 2 (3x) /2(5x)
= 3/5

i,e ratio of the circumference = 3:5