Question

The circumference of a circle can be found using the
formula C = 2 nr.

Answer 1

We know that the circumfrence of a circle equals pi times two.

So how can we rearrange this?

I will substitute pi with 3.14 to make it easier.

`C = 2 (3.14) r` is the original equation.

To make the radius come first, we can the circumfrence by
`2(3.14)`.

`r =(c)/(2(3.14) )` would be the answer.

We can check that:

Suppose r=6

`C = 2(3.14)6\\6.28 (6)\\=37.68`

If the circumfrence is 37.68, we can plug it in to the formula we found.

`6 = (37.68)/(2(3.14)) \\6 = (37.68)/(6.28) \\6 = 6`

It's correct! The answer is the third one!

Answer 2

radius = circumference/2(3.14)
OPTION 3