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An n-sided polygon or n-gon, just like it sounds, has n sides. For example, a 13-sided polygon has 13 sides. A 24-gon has 24 sides.
For a polygon with n sides, there would be n*(n-3)/2
That depends on how many sides the polygon has but in general the number of degrees inside a polygon are: (n-2)*180 = sum of degrees whereas 'n' is the number of sides of the polygon.
n(n-3)/2
A polygon with n sides had n*(n-3)/2 diagonals. So a 20 sided polygon would have 20*17/3 = 170