If the circumference of the circle above is 18.84 units, what is the area? (Use 3.14 for n .)

354.95 units2

28.26 units2

37.68 units2

9.42 units2

Question

If the circumference of the circle above is 18.84 units, what is the area? (Use 3.14 for n .)























































354.95 units2





28.26 units2





37.68 units2





9.42 units2

anonymous · Answer

@k_lynn

mathstudent55 · Answer

From the circumference, find the radius.
From the radius, find the area.

anonymous · Answer

OK.. ;-;

k_lynn · Answer

Ok, to figure this out, you need this formula.  You'll also probably want to memorize it for further use.
$$r=\frac{ C }{ 2\Pi }$$

So what you're basically going to do is divide the circumference of the circle by Pi times 2.

k_lynn · Answer

So...
$$\frac{ 18.84 }{ 2\times3.14}$$

k_lynn · Answer

What do you get when you multiply 2 times pi?

anonymous · Answer

I got 29.5788 ;-;

k_lynn · Answer

Did you multiply that with pencil and paper or with a calculator?

anonymous · Answer

Calculator I am not got at doing math at all.. :( So I guess I messed up with that one...

k_lynn · Answer

Ok. 

|dw:1424637048540:dw|

Do you understand how I got that?