CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2008

  • question_answer
    If\[(3,-2)\]is the centre of a circle and\[4x+3y+19=0\]is a tangent to the circle, then the equation of the circle is

    A)  \[{{x}^{2}}+{{y}^{2}}-6x+4y+25=0\]

    B)  \[{{x}^{2}}+{{y}^{2}}-6x+4y+12=0\]

    C)  \[{{x}^{2}}+{{y}^{2}}-6x+4y-12=0\]

    D)  \[{{x}^{2}}+{{y}^{2}}-6x+4y+13=0\]

    E)  \[{{x}^{2}}+{{y}^{2}}-6x+4y+9=0\]

    Correct Answer: C

    Solution :

    Radius of circle = Perpendicular distance from \[(3,-2)\]to the line\[4x+3y+19=0\]and \[=\frac{4(3)+3(-2)+19}{\sqrt{16+9}}=5\] \[\therefore \]Required equation of circle is \[{{(x-3)}^{2}}+{{(y+2)}^{2}}={{5}^{2}}\] \[\Rightarrow \] \[{{x}^{2}}+{{y}^{2}}-6x+4y-12=0\]


You need to login to perform this action.
You will be redirected in 3 sec spinner