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Math Help - Missing the point?

  1. #1
    Newbie
    Joined
    Mar 2008
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    15

    Missing the point?

    We are to find the center-radius form of the equation of each circle and graph it.
    center is (5,-4) radius is 7
    so I come up with
    (x-5)^2 + (y+4)^2 = 49
    I plot on paper the center point of (5,-4) and from there go 7 in in NSEW on my graph paper, then connect the dots for a circle.
    What now - Should I now come up with center radius co-ordinates?
    How and from what?
    I don't see the connection with all I have done to this point.
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  2. #2
    Super Member
    Joined
    Jan 2008
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    Usually, the coordinates of the centre, and the points you've plotted are sufficient. You might like to add a line from the centre to any point on the circle and indicate that the distance is 7.
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