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Math Help - Equation of a Circle

  1. #1
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    Equation of a Circle

    Well the knowledge of it I just simply forgot about and don't remember a single thing about how to do it.

    Write the equation of a circle with center (4,0) and passing through the point (12,6).

    I don't want just an answer, I need the method of how to do it. Also I might also need help understanding this question as well

    Write the equation of a circle with center (6,6) and tangent in both axes.

    THANKS!!!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by MagicBirdy View Post
    Well the knowledge of it I just simply forgot about and don't remember a single thing about how to do it.

    Write the equation of a circle with center (4,0) and passing through the point (12,6).

    I don't want just an answer, I need the method of how to do it. Also I might also need help understanding this question as well

    Write the equation of a circle with center (6,6) and tangent in both axes.

    THANKS!!!
    the equation of a circle is given by: (x - h)^2 + (y - k)^2 = r^2

    where (h,k) is the center and r is the radius

    so fill in what you know for your circle.

    you are also given the additional information that when x = 12, y = 6, you can use this to solve for r


    for the second question, you know that the circle passes through (0,6) and (6,0) ........which tells you the radius is 6
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