A triangle.
A triangle.
A triangle.
A triangle.
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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, a concave polygon cannot be a regular polygon.
No. There can be no regular concave polygon.
concave
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.