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V125BC [204]
3 years ago
7

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

Mathematics
2 answers:
victus00 [196]3 years ago
5 0
Radius = circumference/2(3.14)
OPTION 3
Yakvenalex [24]3 years ago
5 0

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 =\frac{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 = \frac{37.68}{2(3.14)} \\6 = \frac{37.68}{6.28} \\6 = 6

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

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