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Math Help - Is this right?

  1. #1
    Newbie
    Joined
    Mar 2007
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    Is this right?

    I would like if I have done this correct and I also need help with one thing in this problem.

    What is the area of a circle w/circumference 18pi centimeters? Give your answer in terms of pi.

    My answer so far is: C= 2pi r --> 18pi = 2pi r --> 18pi/2pi = 2pi r/2pi --> 9= r

    A= pi r^2 --> A= pi (9)^2 --> A= 81pi --> A= 254.4690049 centimeters

    Now what I'm confused in is how do I write my answer in pi terms? I have look in my book and I have no luck.

    Thank you for the help.
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  2. #2
    Junior Member
    Joined
    Dec 2006
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    Your solution is correct. To have the answer in pi term, that means that you have to say just 81pi.
    Don't use your calculater to evaluate.
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  3. #3
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    Thank you
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