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An Octagon has 20 diagonals in total.

There is actually a really simple formula to figuring out the diagonals in any polygon: (n-3) x (n/2). If we put 8 in there than it would be (8-3) x (8/2) - 5x4=20, so the answer is 20 diagonals.

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Q: How many diagonals are in an octagon?
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