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How many diagonals in a regular octagon?

Updated: 8/17/2019
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13y ago

Best Answer

20. And the fact that it is regular is irrelevant.

5 from each vertex. So 8 vertices would (you'd think) give 8*5 = 40. Except that you would then be counting each diagonal twice - once from each end. So you need to divide by 2.

40/2 = 20.

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13y ago
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Q: How many diagonals in a regular octagon?
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