waheguru
  • waheguru
I need help solving this
Mathematics
katieb
  • katieb
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waheguru
  • waheguru
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anonymous
  • anonymous
c. or b.
anonymous
  • anonymous
the answer is a

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anonymous
  • anonymous
54 definetly
anonymous
  • anonymous
oh ok
anonymous
  • anonymous
Think of any vertex. It can't connect to itself, nor the two neighboring vertices already connected by edges, but that still leaves 9 vertices to connect to. 12 vertices each connected to 9 other vertices would seem to imply 108 diagonals... except you are double-counting everything (a diagonal from A to B is the same as a diagonal from B to A). So divide this number by 2. Note: The general formula for the number of diagonals in an n-gon is: n(n-3) / 2 Answer: 54 diagonals
waheguru
  • waheguru
Thanks

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