Question

the ratio of th radii of two wheels is 4:5. find the ratio of their cercumference

Answer 1

2πR/2πr = R/r = 4/5
4:5 answer

Answer 2

Given that circumstances are in ratio 3:4

So if first wheel has a radius of 3r then the second will have a radius of 4r

Now circumference of circle 2πr

Circumference for 3r= 2 x π x 3r

=6πr

Circumference for wheel of rad 4r= 2 x π x 4r

=8πr

Now required ratio = circumference of 3r Rad/circumference of 4r rad

= 6πr/8πr

=3/4

So ratio=3:4