SOLUTION: how many diagnols are in an octogon, nonogon, decogon?¿

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Question 28778: how many diagnols are in an octogon, nonogon, decogon?¿
Answer by askmemath(368) About Me  (Show Source):
You can put this solution on YOUR website!
The number of diagonals in a polygon is given by %28n%2A%28n-3%29%29%2F2 where n is the number of sides
So for a Octagog which has 8 sides 8%2A5%2F2 = 4*5 = 20
Can you solve from here?