Convex and Concave Quadrilaterals

Difference between convex and concave Quadrilaterals.
A quadrilateral is a polygon so the same rules apply for a convex polygon.
A convex quadrilateral does not have angles greater than 180 degrees.
A concave quadrilateral has angles greater than 180 degrees.

A Quadrilateral Family Story
http://www.moomoomathblog.com/....2016/12/the-quadrila