It has 9 sides and it can be an regular or a irregular polygon which is called a nonagon
Check: 0.5*(81-27) = 27 diagonals
Chat with our AI personalities
A regular octadecagon (an eighteen sided polygon) would have nine diagonals.
20.
The formula used to find the number of diagonals in a polygon is n(n-3)/2. 30 x 27/2 = 810/2 = 405 diagonals.
A polygon that has 104 diagonals will have 16 sides
A regular octogon (8 sides) has 20 diagonals. An irregular octogon also has 20 diagonals, but only if all its points point outwards.