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.
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.
a quadrilateral has 4 (quad) sides. a square is a quadrilateral.
The angle sum of a quadrilateral is 360degrees
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 normal 2-D quadrilateral would be neither convex or concave. There are three-dimensional quadrilaterals, such as prisms, but it would depend on the shape.
A concave quadrilateral
A quadrilateral cannot have only three vertices.