Question

if the ratio of the diameter of two circles is 2:5, find the ratio of their circumference​

Answer 1

Answer:

ANSWER

Diameter = 2 × radius.

Thus, ratio of diameter = ratio of radius

∴ ratio of radius =3:5

Circumference of a circle =2πr

∴ ratio of the circumference =r

1

:r

2

=3:5

Answer 2

In its simplest form, the ratio of the circumference of a circle to its radius is two to one. For every one unit of radius, there is two units in the circumference.