8 diagonals
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19 * * * * * The correct answer is 8*(8-3)/2 = 20
16 diagonals* * * * *5. To all vertices except itself and one each on either side.
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
People have counted 8 or 4 diagonals. If there was four, they might be missing other diagonals. 8 is the proper answer. If you look at other websites, they say 8 [most webs] . To my opinion, it's 8.
A regular octagon has 8 sides.