If you have a regular n-gon (meaning all the sides & angles are congruent to each other) use the first formula.
x=Degrees Of An Angle & n=Number Of Sides On An N-Gon.
360 / (180 - x) = n
Or, you can use this formula.
x=Degrees Of An Angle & n=Number Of Sides On An N-Gon.
(180(n - 2)) / n = x
However, I am sorry to tell you that I am not very sure how to calculate this for irregular n-gons, but I am pretty sure that it uses this formula.
x=Average Of All The Angles & n=Number Of Sides On An N-Gon.
(180(n - 2)) / n = x
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17-gon - After the dodecagon (12 sided polygon), there is usually just n-gon, where n is the number of sides the polygon has.
n-gon
1/2*(n2-3n) = number of diagonals where n is the number of sides of the polygon.
Not all polygons have names and it is quite acceptable to call one of an unknown specific name a n-gon. Where n is the number of sides.
The sum of the exterior angles of an n-gon is 360 degrees, however many sides it has.