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.
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Well, for it to be a polygon it has to have: 1. Have straight sides ( circle is not a polYgon) 2. Have connect lines to form a figure 3. Must at least have 3 lines( triangles a polygon)
'Regular' means that all the sides on the polygon are the same length and all angles are the same size. On an irregular polygon, the sides can be different lengths and angles can be different sizes.
A 6 sided hexagon polygon can be regular or irregular.
A regular polygon has all its angles equal AND all its sides equal. A nonregular polygon has at least one angle or one side that is different from the others.
They may, or may not, be equal. If you are talking about a regular polygon, all angles are equal in measure. If it is not a regular polygon, the angles are most likely different.