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By definition, a regular polygon has all interior angles the same, but a concave polygon has some interior angles that are not identical. Also, it violates the axiom that all vertices lie on a circle.
While it is possible to construct a polygon with equilateral sides, to be concave would require a form that is equally convex and laterally opposite. (An example is a 'solid arrow shape.')
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Earn +20 ptsQ: Why can't a concave quadrilateral be regular?
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Can a concave quadrilateral be regular?
No.
A square is an example of a quadrilateral that is both a regular concave polygon and a regular convex polygon?
No. There can be no regular concave polygon.
Does a quadrilateral have a convex or a concave angle?
concave
A quadrilateral that is a concave?
A chevron or arrowhead.
What is non convex quadrilateral?
A concave quadrilateral. An arrowhead or a delta, for example.
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