SOLUTION: How many diagonal lines in a icosagon? Thank you!

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Question 97449: How many diagonal lines in a icosagon?
Thank you!
Answer by henyomzky(4) About Me  (Show Source):
You can put this solution on YOUR website!
icosagon has 20 sides
to find how many diagonals u can make is
n(n-3)
------
2
n represents the side
20(20-3)
= -------
2
20(17)
=------
2
340
=----
2
=170---> there are 20 diagonals in an icosagon