Yes it is. It is surely a polygon and convex means all interior angles are less than a straight angle ( i.e.180 degrees).
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No. There can be no regular concave polygon.
Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.
is this a polygon? is it concaver or convex
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 polygon is convex