A polygon with n vertices has n*(n-3)/2 diagonals.
So an octagon has 8*5/2 = 20 diagonals. Of those 20 diagonals, 8 are the principal diagonals, the ones joining a pair of opposite vertices
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An octagon has 16 diagonals.
4 diagonals
None, if it is an irregular octagon.
An octagon has four (4) diagonals, each connecting two opposite vertices.
8