SOLUTION: a circle has a circumference of 42 pi ft. find its area in terms of pi. Can you please show me the steps of how to do this?

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Question 204070: a circle has a circumference of 42 pi ft. find its area in terms of pi. Can you please show me the steps of how to do this?
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!


Area%5BC%5D=%28pi%29r%5E2

We can find the radius since the circumference is given.

Circumference=2%28pi%29r
42%28pi%29ft=2%28pi%29r --->
red%28r=21ft%29

Therefore,
A%5BC%5D=%28pi%29%2821%29%5E2
red%28A%5BC%5D=%28pi%29441ft%5E2%29, (Answer)

Thank you,
Jojo