What do you mean by "dent"?
A curve? A polygon cannot have a curve anywhere along its edge. A polygon is defined to have straight edges only. Other shapes besides polygons exist, such as circles and ellipses and the like, but they are not polygons.
If you mean that a part of the shape comes inward toward the body/center of the polygon... but the edges are still straight... then the only shapes that can do this have at least five sides. And polygons that do this are called "concave polygons". Look up what a concave polygon is to verify this is what youre talking about.
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concave
ConvexA convex polygon does not have a "dent" in it.
It is a shape that don't have a dent in it ~ And that it can be any shape but the ones with dents.
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.
irregular