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
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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.
is this a polygon? is it concaver or convex
It depends if the polygon is convex or concave but if it is a regular polygon it would have 560