Question

The ratii of two circles is 4:9.find the ratio of their circumference

Answer 1

r=2,r2=3
2πr:2πr2
=r:r2
=2:3

Answer 2

r1 / r2 = 4/9
thus
2pi r1 / 2 pi r2 = r1 / r2 = 4/9 = 4:9