1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quick math question

  1. Dec 4, 2007 #1
    d=n^2 - 3n / 2

    where d = number of diagonals
    and n = the number of sides of the polygon.

    A polygon has 119 diagonals, how many sides does it have?

    119 = n^2 - 3n / 2

    I am not sure how to do this? can someone please help?

    sorry this isn't physics related
  2. jcsd
  3. Dec 5, 2007 #2
    An n-sided polygon has this many diagonals:


    Solve for [tex]n[/tex].
  4. Dec 5, 2007 #3


    User Avatar
    Science Advisor
    Homework Helper

    Quadratic Formula
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Quick math question
  1. Quick maths question (Replies: 10)

  2. Quick math question (Replies: 17)

  3. Quick math question (Replies: 4)