SOLUTION: How many diagonals can be drawn from a vertex of an n-gon?

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Question 699232: How many diagonals can be drawn from a vertex of an n-gon?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many diagonals can be drawn from a vertex of an n-gon?
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# of line segments joining 2 vertices = nC2 = [n(n-1)]/(2)
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# of those line segments that are sides of the n-gon: n
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Therefore, # of diagonals: nC2-n = [n(n-1)]/2 - n
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Cheers,
Stan H.
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