A n sided figure has 1/2 n(n - 3) diagonals
→ a 17-gon has 1/2 x 17 x (17 - 3) = 1/2 x 17 x 14 = 119 diagonals
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2 diagonals
It has 2 Diagonals!!!
It has 27 diagonals
14 diagonals
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.