SOLUTION: 2. Determine how many diagonals a 20-gon has.

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Question 635136: 2. Determine how many diagonals a 20-gon has.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint:

Any n-gon has n%2A%28n-3%29%2F2 diagonals.