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-   -   The equation of a diameter of a circle passing through the origin is x + why = 1 and th (https://www.askmehelpdesk.com/showthread.php?t=559979)

  • Mar 6, 2011, 12:51 AM
    lee1111
    The equation of a diameter of a circle passing through the origin is x + y = 1 and th

    ModEDIT: Posts merged

    the equation of diameter of a circle passing through the origin is x y=1 and the greatest distance of any point of the circle from the diameter is (5)^1/2.then the equation of the circle is?
  • Mar 6, 2011, 10:15 AM
    galactus

    Didn't you preview your problem before posting? It appears to be cut off?

    Do you need the equation of a circle whose diameter is the line x+y=1?

    There could be many circles with radius on this line, but say you want one that passes through
    (1,0) and (0,1).

    The line y=-x+1 crosses the x-axis at (1,0) and the y-axis at (0,1).

    The distance between these two points is then

    This is the length of the circles diameter. Thus, the radius is

    By using the midpoint formula, we find the circle has center

    Now, there's the center and radius, write out the equation.

  • Mar 7, 2011, 08:58 AM
    Unknown008

    The general equation of a circle is:



    where (a, b) is the coordinates of the centre of the circle and r is the radius of the circle.

    As you can see, this is similar to the equation that galactus posted above, but with a = 1/2, b = 1/2 and r = \sqrt{2}/2.

    Can you give your problem a try?
  • Mar 8, 2011, 11:21 AM
    lee1111
    Comment on galactus's post
    I tried to solve the problem but I am not getting the correct answer... :(
    Its given that greatest distance of any point of the circle from the diameter is root 5
  • Mar 8, 2011, 12:26 PM
    Unknown008

    What answer did you come to?

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