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Q: Can a concave quadrilateral be a regular?

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A concave quadrilateral would be a non-convex quadrilateral. * * * * * Also known as delta or arrowhead or chevron.

Yes, be it a common convex quadrilateral or a concave quadrilateral. For a convex quadrilateral, the most obvious example is a irregular trapezium, where the upper base and the lower base are of different length, and the slanted sides are of different length. It is similar for a concave quadrilateral.

parallelogram

square

A reflex angle is over 180 degrees, but the sum of the angles in a quadrilateral, concave or convex, is 360. Therefore, since 180+180=360, you can't have any more degrees even without the amount over 180 that the reflex angle has.

Related questions

No.

No. There can be no regular concave polygon.

concave

A concave quadrilateral would be a non-convex quadrilateral. * * * * * Also known as delta or arrowhead or chevron.

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 concave quadrilateral - like an arrowhead or chevron.

A chevron or arrowhead.

yes it will...

A concave quadrilateral. An arrowhead or a delta, for example.

No. A trapezoid has two parallel sides. This is not possible in a concave quadrilateral.

It would be a concave quadrilateral The link below has some pics.

A square is a regular 4 sided quadrilateral

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