It is a plane area enclosed by four sides, such that each interior angles is less than 180 degrees.
A quadrilateral has 2 diagonals. It does not matter whether it is convex or not.
no
If any of the angles is greater than 180 degrees, the quadrilateral is concave.
Yes, such a quadrilateral could be shaped like an arrow head - (a large V capping a smaller v).
how many sides convex quadilaterals have
A concave quadrilateral. An arrowhead or a delta, for example.
yes
It may or may not be.
concave
A concave quadrilateral would be a non-convex quadrilateral. * * * * * Also known as delta or arrowhead or chevron.
It would be a concave quadrilateral The link below has some pics.
It is a convex quadrilateral, as the remaining angles could be any two angles with a sum of 180 degrees.