Suppose the area of a circle is 4pi. What is its circumference?

Question

micahm · Answer

https://answers.yahoo.com/question/index?qid=20110924155710AAf3ktd

anonymous · Answer

Can you help me with a few more?

geerky42 · Answer

@micahm  It is in reversed. s/he was given area and asked to find circumference, not other way around.

Anyway, you can find radius from area using $A=\pi r^2$, where $A=4\pi$

Can you solve for r?

anonymous · Answer

BTW my school computer has blocked all websites but yahoo and openstudy.

anonymous · Answer

I'm a guy.

anonymous · Answer

r = 2

so d = 4 so the circumference is also 4pi

geerky42 · Answer

s/he = she or he.

No need to tell your gender.

anonymous · Answer

So what if the area was 4pi and i was trying to find the radius?

geerky42 · Answer

Well, you first try to find radius from area, then you can plug in that value in formula of circumference $C = 2\pi r$.

anonymous · Answer

I just got back from tearing through the house trying to catch my siblings. They had my calculator.

anonymous · Answer

@geerky42

geerky42 · Answer

Ok, so you know what radius is, right?

anonymous · Answer

Uh, yeah...

isaiah.feynman · Answer

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