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Math Help - simple(?) area of a circle question

  1. #1
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    simple(?) area of a circle question

    Ok, so I have to give the answer in the correct amount of significant digits.

    The diameter of a circle is 16.0m. Find the area.

    I know how to work the answer out correctly, but I am unsure of how many significant digits I should use..

    16.0m/2=8

    pi(8^2) = area

    so... do I use 3 significant digits (based on 16.0) or do I use 1 significant digit (based on 8)?
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  2. #2
    MHF Contributor ebaines's Avatar
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    Re: simple(?) area of a circle question

    You use 3 significant digits, because that's the data you were given. More formally the calculation is:

    16.0m/2 = 8.00m
    pi(8.00m)^2 = area
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  3. #3
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    Re: simple(?) area of a circle question

    Quote Originally Posted by ebaines View Post
    You use 3 significant digits, because that's the data you were given. More formally the calculation is:

    16.0m/2 = 8.00m
    pi(8.00m)^2 = area
    Thank you! That's what I thought but wasn't sure!
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  4. #4
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    Re: simple(?) area of a circle question

    why are you so confused? as we know and work with this formula. In my opinion we should follow all given formulas of maths to got each results properly. You can choose free tutoring online for that purpose.
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