Not all polygons are concaves.
For it to be a concave, it must have an outline or surface pointing inwards, like a depression. The opposite is "convex." Most regular polygons are convex, while some will be concave.
Think about it this way: con = with (generally, and sometimes), cave = going inward, or bending inward, etc.
CONCAVE is the result of those two put together, so it must mean that one or more of its outlines or surfaces must be pointing inwards! :)
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No, a concave polygon cannot be a regular polygon.
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 concave polygon.
A [concave] pentagon.