Question

What is the circumference of a circle with a diameter of 4 cm?

Answer 1

`4 \pi` cm

Explanation:

`pi` is defined as the ratio of a circle's circumference `C` to its diameter `d`. So

`C = \pi d = 4 pi` cm

Answer 2

4`pi`

Explanation:

the diameter is 4 cm which means the radius is 2 cm. Diameter divided by two will give you the radius. The formulae for circumference is 2 `pi*r`. So the circumference would be 4`pi`