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No. There can be no regular concave polygon.

Q: A square is an example of a quadrilateral that is both a regular concave polygon and a regular convex polygon?

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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.')

Dragon is the answer

No, a concave polygon cannot be a regular polygon.

No.

which type of quadrilateral is never a regular polygon

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No.

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.')

No not every quadrilateral can be a regular polygon.

Dragon is the answer

No, a concave polygon cannot be a regular polygon.

No.

which type of quadrilateral is never a regular polygon

A trapezoid is an example of a regular polygon or a geometrical shape. It is also an example of a quadrilateral.

A regular polygon has all its angles of equal measure, and its sides of equal length. In the case of a quadrilateral, that would mean a square. A concave quadrilateral must have at least one reflex angle and so cannot be a square. So it cannot be regular.

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

no