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A regular polygon has a center, much as a circle does. There are also the sides which are all the same lengths. Then there is the apothem which is any segment that goes from the center and is perpendicular to one of the polygon's side. Then angles are also parts and they are all the same. You might consider the perimeter a part and of course it is the sum of the sides.
A concave polygon.
A regular 18-gon, also known as an octadecagon, has 18 sides. Each side is of equal length, and each internal angle measures 150 degrees. This polygon is part of the family of polygons that can be defined with any number of sides.
one part in every hundred
A polygon is an enclosed plane area whose boundaries comprise straight lines. So the area must be enclosed. However, the boundaries themselves may or may not be included in the definition. If the boundaries do not form part of the polygon then it is open; otherwise it is closed.This is analogous to a < x < b is the open set, (a, b) and a