A nonconvex polygon is a concave polygon. All polygons with 4 or more sides can be concave. An arrowhead is an example of a concave quadrilateral. The back of an envelop (where the sides are folded and glued together) is a concave pentagon.
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A convex polygon
No it CANT be a polygon because its open a polygon has to be close
an irregular polygon is a polygon that is the opposite of a regular polygon in a regular polygon the sides are the same and the angles are the same and irregular is the opposite.
No, a circle is not a polygon
All the sides of a regular polygon have the same length. If two or more sides of a polygon have different lengths, then the polygon is not regular.