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.
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If 'n' is the number of sides in a polygon with equal side length, then the number of sides is equivalent to (n-2)*180 degrees = total degrees in the polygon. E.g.) A polygon is even-sided with 360 degrees in its interior. How many sides does it have? Answer: (n-2)*180 = 360 n - 2 = 2 n = 4
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If there is regular polygon(having equal sides), then perimeter is L*N where L is length of side and N is no. of sides. If polygon is not regular then may Perimeter is equal to sum of all sides, if size of each side is known.
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.