ratio of their radii

Question

Given two circles (all circles are similar), with circumferences of 6 cm and 16 cm each, find the ratio of their radii

Answer 1

Tigerlilly, the ratio of their radii is simply the same as the ratio of their circumference. Here is why.

 

C1/C2 = 2*pi*r1/(2*pi*r2) = r1/r2

 

Hence, the ratio of their radii is:

 

6/16=3/8.