SOLUTION: how many sides does an octagon have?

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Question 218494: how many sides does an octagon have?
Answer by tlouvierre(4) About Me  (Show Source):
You can put this solution on YOUR website!
20 diagonals
For any n-sided polygon, the formula for the number of diagonals is (n/2) x (n-3), so for an octagon it is (8/2) x (8-3) = 4 x 5 = 20.