Given:
Circumference of a circle = C
Diameter of a circle = d
To find:
The relationship between the circumference, c, and diameter, d, of any circle.
Solution:
We know that, circumference of a circle is

It can be written as

![[\because d=2r]](https://img.qammunity.org/2021/formulas/mathematics/high-school/hvz574gov2dnloetwj4zx3ckmyf2a7p679.png)
On dividing both sides by d, we get

Therefore, the correct option is (F).