No. There can be no regular concave polygon.
no because it is curved I think and polygons cannot be curved.
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.
it is impossible
No, regular polygons are always convex and are shapes constructed using straight lines. concave polygons are irregular.
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.
FALSE my friends
A concave polygon cannot be regular because regularity requires all angles (and sides)to be of equal measure. Even if you drop the requirement of regularity, there cannot be a concave triangle.