convex
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No. There can be no regular concave polygon.
Any polygon that has an angle that is > 180º is a concave polygon. A convex polygon does not. e.g. All regular polygons are convex.
A regular polygon is a special kind of convex polygon - one in which all the sides are of the same length and all the angles are equal. Convex and concave polygons form disjoint sets: so no concave polygon can be regular.
no it cannot , because a regular polygon is a shape with equal sides, and for it to be concave or convex some sides have to jut out or in See related link below for more information
concave