A regular pentagon has straight sides and is closed so its a polygon. Any shape with straight sides and is closed is a polygon. Example O (circle) has curved lines so its not a polygon L (square) is open therefore it is not a polygon.
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A pentagon can be regular or irregular.
Any polygon can be regular or irregular. "Regular" means all of its sides have the same length. Your pentagon is regular if all of its five sides have the same length. If not, then it's an irregular pentagon.
A 5 sided pentagon can be a regular or an irregular polygon.
A 5 sided pentagon is not regular when its sides are not of equal lengths.
== == A regular pentagon is a polygon that has five sides