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# Fin the area of a circle whose circumference is 20rr units

### Resolved Question:

Fin the area of a circle whose circumference is 20rr units.
Submitted: 8 years ago.
Category: General
Expert:  Scott replied 8 years ago.

Hi there!

I can't move this to the math category... the system is broken tonight.

Can you tell me what "rr" is?

Thanks,

Scott

Customer: replied 8 years ago.
Expert:  Scott replied 8 years ago.

Really?

So it says that the circumference is:

Is that right?

-Scott

Customer: replied 8 years ago.
sorry, I believe it is the pie symbol
Expert:  Scott replied 8 years ago.

Ok, that makes a lot of sense!

C = 20pi

Get the radius first:

C = 2piR

Plugging in C:

2piR = 20pi

Divide by 2pi:

R = 10

Get the area, using the area formula:

A = pi*R^2

A = pi*10^2

A = 100pi square units

Let me know if you have any questions,

Scott

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