Question

The figures below are similar.

4 cm
8 cm


What is the ratio of the circumference of the smaller circle to the circumference of the larger circle?

Write your answer as the ratio of two whole numbers separated by a colon (for example

Answer 1

The answer is 1:2

Explanation:

For small circle

r = 4

2πr = 2 × 3.14 × 4 = 25.12

For big circle

r = 8

2πr = 2 × 3.14 × 8 = 50.24

Now,

if we divide both answers we get,

25.12 ÷ 50.24 = 1/2 = 1:2