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BCECE Engineering BCECE Engineering Solved Paper-2008

  • question_answer
    The length of the tangent drawn to the circle \[{{x}^{2}}+{{y}^{2}}-2x+4y-11=0\]from the point \[(1,3)\]is                                              

    A)  1                            

    B)         2                            

    C)  3                            

    D)         4

    Correct Answer: C

    Solution :

    The length of the tangent drawn to the circle \[{{x}^{2}}+{{y}^{2}}-2x+4y-11=0\]from the point\[(1,3)\] \[=\sqrt{{{1}^{2}}+{{3}^{2}}-2.1+12-11}\]                 \[=\sqrt{1+9-2+12-11}\]                 \[=\sqrt{22-13}=\sqrt{9}\]                 \[=3\]


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