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

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) (Show Source): You can put this solution on YOUR website!
The number of diagonals in a polygon is given by where n is the number of sides
So for a Octagog which has 8 sides = 4*5 = 20
Can you solve from here?
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