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Cartesian equation: (y-1)^ + (x-2)^2 = a^2 will circle cross any axes? how big is a? watch

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    please help!
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    (Original post by zezno)
    please help!
    Depends entirely on the value of a
    Sketch some circles with centre (2,1) and observe what values of radius it doesn't cross any, touches x axis, crosses x-axis but not y, crosses both axes

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    a is the distance from the point (2, 1) to a point that lies on the circle so a can be any positive real number and it is independent of the centre of the circle. You would need more information to say what a was.
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    (Original post by zezno)
    please help!
    Badly worded question as the amount of intersection depend on a. Write down the possible cases where the circle can and cannot intersect the axis, as well as tangent scenarios, then follow them through with the appropriate conditions for a.
 
 
 
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Updated: October 28, 2016
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