BCECE Engineering BCECE Engineering Solved Paper-2013

  • question_answer
    The centroid of the triangle is \[(3,3)\] and the orthocentre is \[(-3,5),\] then its circumcentre is

    A)  (0, 4)               

    B)         (0, 8)    

    C)         (6, 2)               

    D)         (6,-2)

    Correct Answer: C

    Solution :

    Since, the centroid divides the join ortnocentre and circumcentre in the ratio 2:1 Let the circumcentre of triangle is \[(\alpha ,\beta ).\] \[\therefore \]  \[G(3,3)=G\left( \frac{2\alpha -3}{2+1},\frac{2\beta +5}{2+1} \right)\] \[\Rightarrow \]  \[G(3,3)=G\left( \frac{2\alpha -3}{3},\frac{2\beta +5}{3} \right)\] \[\Rightarrow \]\[\frac{2\alpha -3}{3}=3\]and \[\frac{2\beta +5}{3}=3\] \[\Rightarrow \]\[2\alpha -3=9\]and \[2\beta +5=9\] \[\Rightarrow \]\[2\alpha =12\]and \[2\beta =4\] \[\therefore \]  \[\alpha =6\]and \[\beta =2\]


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