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JEE Main & Advanced Mathematics Circle and System of Circles Question Bank Tangent and normal to a circle

  • question_answer
    If the line \[x=k\]touches the circle \[{{x}^{2}}+{{y}^{2}}=9\], then the value of k is

    A)            2 but not - 2                             

    B)            - 2 but not 2

    C)            3    

    D)            None of these

    Correct Answer: C

    Solution :

               \[k=3,\] as perpendicular from centre on line = radius.


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