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Thread: Equation of a circle?

  1. #1
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    Equation of a circle?

    2 (x-1)squared+2 (y+2)squared=7
    I got center=1,-2 and r=1.9. Does that look correct?
    Last edited by Nfalconer; Jul 7th 2018 at 08:15 PM.
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Equation of a circle?

    Your radius appears to be rounded to one decimal place...it is actually:

    $\displaystyle r=\sqrt{\frac{7}{2}}$
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    Re: Equation of a circle?

    Quote Originally Posted by Nfalconer View Post
    2 (x-1)squared+2 (y+2)squared=7
    I got center=1,-2 and r=1.9. Does that look correct?
    Quote Originally Posted by MarkFL View Post
    Your radius appears to be rounded to one decimal place...it is actually:

    $\displaystyle r=\sqrt{\frac{7}{2}}$
    To add a bit: If you can give an exact answer, such as MarkFL's, it is best to do so.

    -Dan
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    Re: Equation of a circle?

    When graphing the circle do i graph it 1.9 away from center or 1.3?
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  5. #5
    MHF Contributor MarkFL's Avatar
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    Re: Equation of a circle?

    The circle will be the set of all points that are a distance $\displaystyle r$ from the center. So, approximately 1.9 units from the center.
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