BCECE Engineering BCECE Engineering Solved Paper-2010

  • question_answer The number of diagonals that can be drawn by joining the vertices of an octagon, is

    A)  28                         

    B)         48                         

    C)  20                         

    D)         None of these

    Correct Answer: C

    Solution :

    The total number of lines obtained by joining 8 vertices of octagon \[={{\,}^{8}}{{C}_{2}}=\frac{8.7}{2}=28\] But out of these 28 lines, 8 are sides and remaining are diagonals. Hence, the number of diagonals \[=28-8=20\]


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