Question

Question #39e7f

Answer 1

`4pi`

Explanation:

The formula for the circumference of a circle with radius r is `2rpi`. We replace r with `2` to get `2*2pi=4pi`.

So the answer is `4pi`.

Answer 2

`2pi(2) = 4pi ~~ 12.566`

Explanation:

The equation to calculate the circumference of a circle is `2pir` or `pid` (they are the same since `d = 2r` when d is the diameter and r is the radius.

Therefore, you just need to plug the radius of 2 into the equation `2pir` to find the circumference:
`2pi(2) = 4pi ~~ 12.566`