Question

5. The radiof two circles are in the ratio 2:3. What is the ratio of their circumferences?​

Answer 1

Given:-

radii of two circles are in the ratio = 2:3

so the radii are 2r:3r

To find:-

ratio of their circumference,

Formulas required:-

circumference = 2πr

Ratio of their circumference,

$= \frac{2\pi(2r)}{2\pi(3r)} \\ = \frac{2}{3} \\ = 2:3$

Therefore the ratio of their circumference is 2:3