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

  • question_answer
    The length of tangent from the point (5, 1) to the circle \[{{x}^{2}}+{{y}^{2}}+6x-4y-3=0\], is                       [MNR 1981]

    A)            81  

    B)            29

    C)            7    

    D)            21

    Correct Answer: C

    Solution :

               Length of tangent is given by \[{{L}_{T}}=\sqrt{{{S}_{1}}}=\sqrt{49}=7\].


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