Placing a question mark at the end of a phrase does not make it a sensible question. Yes, diagonals in an octagon do exist. But try to use a whole sentence to describe what it is that you want answered.
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8 diagonals
octagon
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
No.
16 diagonals* * * * *5. To all vertices except itself and one each on either side.