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

The circumference of a circle can be found using the formula C = 2 nr.-example-1
User Cat
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2 Answers

6 votes

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!

User Noella
by
7.8k points
7 votes
radius = circumference/2(3.14)
OPTION 3
User Shamik
by
7.8k points

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