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Math Help - Convex polygons

  1. #1
    Newbie
    Joined
    Oct 2007
    Posts
    5

    Convex polygons

    What is the quickest way to solve this?

    If a convex polygon has n sides and 25n diagonals, find the value of n.

    Thanks!

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  2. #2
    Junior Member
    Joined
    Jun 2007
    Posts
    65
    Hmm...I think you would solve it like this

    \frac{n(n-3)}{2}=25n

    Solve for n.

    I got n = 53 when solving. I hope that's right sorry if its not.
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